Name: DCS 12V 120AH Super Slimline
SKU: DCS-12V-120AH-SL
Availability: InStock

“DCS 12v 200ah Slimline (Lithium)” has been added to your cart. View cart

DCS 12V 120AH Super Slimline

SKU: DCS-12V-120AH-SL

DCS 12V 120AH Super Slimline

Ultra-Safe

Explosion-proof / No leakage

Stable

Low Internal Resistance / Proven Stability

Long Life

Ultra-long cycle life

Guaranteed A Grade

Contracted A Grade cell supply

Perfect for UTEs, Dual Cabs, Canopies and Campers, Capable of Starting Large Diesel Engines with 1200 LCA
DCS 3.2V 20Ah Cylindrical (LifePO4) Cells
Equipped with a powerful 200A DCS BMS and Active CMS
Housed in a Metal Enclosure with a White Pearlescent Finish
Weight: 21.40KGs
4000 Cycles @ 100% DOD ≥ 80% Capacity Retention @ 25°C
Temperature working range -25 degrees to 80 degrees C
Backed by a 5-year Unlimited Cycle Warranty

Availability: In Stock

Original price was: $1,599.00.Current price is: $1,499.00.

DCS Premium 120Ah Slimline Lithium Battery – Engineered for Performance and Built to Last

The DCS Premium 120Ah Slimline Lithium Battery is purpose-built for demanding off-grid and mobile power applications. Engineered with 2 x 120A Anderson terminals —internally bridged with high-conductivity copper busbars—these batteries provide increased connection flexibility and are capable of supporting high-current loads with ease.

Designed for scalable power systems, the slimline form factor allows for seamless side-by-side stacking, making parallel expansion straightforward and efficient.

At the core of each battery is our Australian-designed DCS Battery Management System (BMS) and Cell Management System (CMS). This sophisticated architecture supports continuous operation with inverters up to 2000W and has been rigorously tested to MIL-STD-810G vibration standards—ensuring reliability and durability in the harshest conditions.

What sets our Premium range apart is the use of high-performance cylindrical cells, selected for their superior thermal and safety characteristics. These cells are fully encapsulated in advanced thermal interface resin, enhancing thermal stability and dramatically extending service life – especially in tropical and high-humidity environments such as Cape York, the Torres Strait, Darwin, and Northern WA. If you demand a battery that performs under extreme conditions, you’ve just found your ideal solution.

DCS 120A Anderson Plug to M8 Cable

Click Here for more information

To further safeguard longevity and performance, all electronics, including the BMS, are sealed to IP68 standards, making them fully waterproof and dust proof – impervious to condensation, humidity, and the elements.

Every DCS battery comes standard with our DCS Lithium Bluetooth Monitoring System, available on both Android and iOS platforms. This system delivers real-time, high-resolution insights far superior to traditional third-party battery monitors.

Encased in a durable, serviceable metal enclosure, our batteries are built for long-term use. Even beyond the 5-year warranty, all components – including cell packs and BMS electronics – remain fully supported. Should servicing be required, our expert technicians at our Coomera, Queensland facility are available for upgrades and repairs.

DCS Premium 120Ah Slimline Lithium Battery – Engineered for Performance and Built to Last

Designed for scalable power systems, the slimline form factor allows for seamless side-by-side stacking, making parallel expansion straightforward and efficient.

Compact yet powerful, the DCS Slimline 200Ah is the perfect fit for utes, dual cabs, canopies, camper trailers, and caravans—especially where space is at a premium. With 1000 LCA (Lithium Cranking Amps), it’s more than capable of starting even large diesel engines, making it a true all-in-one power solution.

Specifications:	–
Nominal Voltage	12.8V
Nominal Capacity (1Hr)	120Ah
Case Dimensions (L x W x H)	690mm x 50mm x 305mm
Weight	21.40 Kg
Cycling voltage	11.5 ~ 14.6V
Charge voltage	14.0 ~ 14.6V
Float Voltage	13.5 ~ 13.7V
Maximum Charge Current	120A
Recommended Charge Current	≤80A
Maximum Discharge Current	≤160A
DCS BMS (internal)	DCS active cell management system, over/under voltage, over current charge/discharge, low/high temperature protections, satisfies the AS/NZS 3001.2:2022 lithium battery standards
Cell Chemistry	DCS 3.2V 20Ah Cylindrical LFP (LiFePO4)
Cycle Performance	4000 Cycles @ 100% DOD ≥ 80% Capacity Retention @ 25°C
Cell Pack Design	Laser Welded Aluminium With Thermal Interface Resin
LCA	1000
Ingress Protection	IP53
Case	Metal With Pearlescent White Finish
Operating temp Range	-25°C to 80°C
Terminals	Twin 120A Anderson Plugs
Parallel Connections	Up To 10
Series Connections	No
Warranty	5 years
Certifications	UN 38.3, UL 1642, IEC 62133 & 62619, CE

DCS Lithium – Bluetooth Monitoring System

Cell status showing real-time cell balancing operation
BMS MOSFET temperature (great info when you are winching or running a large inverting load or your trolling motor to know how hard you are pushing the electronics).
SOC% Estimate
Battery Pack voltage, Power, Current and cycle count
Connectivity distance up to 10m
Now there is no need to install battery monitors or shunts in boats, campers or vehicles. You have all the info you need at your fingertips.
Assists installers & integrators to quickly diagnose any system issues.

DCS Lithium Battery Safety & Reliability

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Slim Line Lithium Battery for Heavy-Duty Diesel Engines

The DCS slim line lithium battery is built for tough jobs, like starting big diesel engines in UTEs and dual-cab vehicles. It has a powerful 1200 LCA (Cold Cranking Amps) that helps your engine start quickly, even in hard conditions. The battery is super safe, designed to avoid explosions and leaks, so it’s perfect for rough and demanding work.

This battery is built to last a long time and works smoothly every time you need it. It’s a great choice if you need a strong and reliable power source for your vehicle.

Slim Line Lithium Battery for Versatile Outdoor Applications

The DCS slim line lithium battery is made to handle lots of outdoor uses. Whether you’re camping, traveling in a caravan, or just exploring, this battery will keep you powered up. It’s slim and small, so it fits into tight spaces, but it still gives you top-notch performance. It’s strong and dependable, so you can enjoy your adventures without worrying about losing power.

Here are some important features of the DCS slim-line lithium battery:

Lightweight: Weighs only 31.50 kg, making it easy to handle.
Handles Extreme Temperatures: Works in temperatures from -25°C to 80°C.
Long Warranty: Comes with a 5-year unlimited cycle warranty for your peace of mind.
Lasts a Long Time: Can go through 4000 cycles at full discharge and still keep at least 80% of its capacity.

This battery is a great option for anyone looking for a strong and reliable power solution for outdoor use.

DCS 120Ah Battery – Strong and Reliable for Tough Jobs

When you need a battery you can count on, the DCS 120Ah battery is a smart choice. It’s built to handle tough conditions, like marine environments, off-road vehicles, and industrial work. The battery is tough enough to deal with constant movement and bumps. Whether you’re using it for a home solar power system or powering an off-grid setup, this battery will give you steady and reliable energy.

Key Features of the DCS 120Ah Battery

No Memory Effect: Our 120Ah battery keeps its full capacity even if you charge it before it’s fully drained.
Energy Efficient: Great for saving extra energy from solar panels to use later.
Easy to Monitor: The DCS LFP Mobile App shows you the battery’s temperature, charge level, and more in real time.
Built to Last: Comes with a 4-year replacement warranty, so you know it’s a good investment.

If you choose a DCS 120Ah battery, you’re getting a durable and advanced product that helps you save money and energy over time.

Safe Transport with the 100Ah Slimline Lithium Battery

The DCS 100Ah slimline lithium battery isn’t just powerful—it’s also built to be transported safely. It has a special UN 38.3 certification, which means it’s passed many safety tests. These tests check how well it handles things like changes in altitude, extreme temperatures, vibrations, and sudden impacts. The battery is proven to handle being shipped by air, sea, or land without any problems.

When you choose this battery, you can feel safe knowing it won’t cause fires or leaks during transport.

Safety Testing for the 100Ah Slimline Lithium Battery

The DCS 100Ah slimline lithium battery goes through many tests to make sure it’s safe to move around. These tests prove it can handle tough situations while being transported. Here’s what it goes through:

Altitude Tests: Makes sure it works well at high elevations.
Temperature Tests: Checks that it stays stable in very hot or very cold conditions.
Bump Tests: These tests check if the battery can handle shakes and bumps while being moved.
Drop Tests: Makes sure the battery won’t break or stop working if it gets dropped or hit.
Safety Checks: Shows proof that the battery is safe and meets all the rules.

When you pick the DCS 100-Ah slimline lithium battery, you’re getting a battery that’s been checked for safety and works well. It’s a smart choice if you need a strong and reliable power source.

Stay Prepared with a 120 Ah Lithium Battery

The endless innovative solutions in construction and technology demand the DCS 120 Ah lithium battery. With its precise lithium iron phosphate chemistry, this modern-day battery stores massive energy while compacting. Now, energy will not be an issue while camping, in emergencies, or even living off the grid. The benefits do not end there; unlike other lead-acid batteries, with the DCS 120-Ah lithium battery, active maintenance and constant upkeep are eliminated. Now, when you require energy, it will be there on demand.

Moreover, the DCS 120-Ah lithium battery can be used in extreme climates due to its outdoor and indoor compatibility. Now, your energy partner will be with you on every excursion and hold your trust in ensuring a constant power supply. There is no need for you to worry about power outages, needing a solution and reliable safety features, so go outdoors without care. When partnering with DCS, you are guaranteed cutting-edge quality.

Effortless Power Backup with 120 Ah Lithium Battery

With DCS’s 120 Ah lithium battery, providing reliable power backup is simple. Here are the key benefits:

Considerably lightweight, allowing for easy transport and versatility.
Special construction allows quick charging, minimising downtime.
Designed for long cycle life and sustainability.
Can be transported and handled safely due to UN 38.3 certification.

When you invest in the DCS 120-Ah lithium battery, you invest in an effective power solution that expands your capability for preparedness, whether in the office, at home, or on the move. That’s great because you can have peace of mind knowing that the energy storage is dependable whenever you need it.

Slimline Lithium Battery 100ah – Compact and Reliable Power Solution

The slimline lithium battery 100ah is a lightweight, compact, and flexible battery solution for many energy systems. Its groundbreaking design allows consumers to take advantage of its vast power capacity while promising low volume. This makes it suitable for both domestic and industrial use.

DCS continuously seeks to provide cutting-edge products that stand by national and international safety standards so that the slimline lithium battery 100-ah is efficient, effective, and reliable.

Safety Certified Slimline Lithium Battery 100ah for Versatile Applications

Safety-approved slimline lithium battery 100ah easily rests on users’ minds regarding the global transportation guidelines, which are critical for users with safety concerns. This battery passes all enveloping tests from the UN 38.3 guidelines, ensuring a minimal risk during transport.

Designed for external and mobile applications
Eco-friendly with low discharge rates
Perfect for emergency backups
Strong protection against thermal events.

DCS believes that safety should always come first in transportation so consumers have peace of mind concerning the slimline lithium battery 100-ah’s quality standards. This pursuit of power and DCS’s commitment to expand the possibilities of safety in battery technology reveals their strong adherence to prescription power and safety limits.

Experience Reliable Performance with the 120 Ah Lithium Battery from DCS

When you need a dependable source of power that can keep up with your modern energy demands, the 120 Ah lithium battery by Deep Cycle Systems stands out. Whether you’re building an off-grid setup, powering your 4WD, or supporting a solar array, this battery delivers consistent output without the hassle of ongoing maintenance or voltage fluctuations.

What sets this battery apart is its internal construction—premium cylindrical LiFePO₄ cells combined with DCS’s proprietary BMS software ensure safe and steady performance across all conditions. It’s made to last through thousands of deep cycles without capacity fade while staying lightweight, compact, and efficient. With the 120 Ah lithium battery, you choose advanced energy storage built for Australia’s most demanding environments.

How the 120 Ah Lithium Battery Powers Off-Grid and Backup Systems

The 120 Ah lithium battery is the ideal solution for users who need independence from the grid or a reliable backup system.

Retains over 80% capacity after 4000 full discharges
Compatible with solar, DC-DC, and AC chargers
Sealed, maintenance-free design ideal for indoor or mobile use
Fast recharge capability reduces downtime during cloudy days
BMS ensures protection against overcharge, heat, and short circuits

If you’re investing in energy independence, the 120 Ah lithium battery provides peace of mind with every charge.

Long-Lasting Energy in a Compact Design with 120Ah Lithium Technology

In tight installations and mobile setups, size and weight matter. The 120Ah lithium battery from DCS is engineered to deliver high-capacity energy storage without taking up unnecessary space. Whether fitting it into a drawer system in a van or behind a seat in your 4WD, this battery allows you to go further—without adding bulk or complexity.

Made with lithium iron phosphate chemistry, this battery holds up under heat, vibration, and deep cycling. It’s the kind of product you install once and count on for years. The 120Ah lithium battery offers serious runtime, rapid recharge, and full-depth discharge without the typical wear you’d expect from older technologies.

Where the 120Ah Lithium Battery Excels in Modern Mobile Setups

Perfect for travel and remote operations, the 120Ah lithium battery supports many off-grid needs.

Slim, lightweight design fits in vehicles, trailers, and utes
Handles daily cycling without performance drop
Works with inverter systems to power appliances on the go
Compatible with solar charging and vehicle alternators
Built tough for harsh Aussie terrain and temperature swings

When you’re always on the move, the 120Ah lithium battery allows you to explore without worrying about your power supply.

Built to Last: The Durable and Powerful Lithium 120Ah Battery

The lithium 120Ah battery is built for users who demand more life, reliability, and performance. Backed by military-grade cell chemistry and engineered by Deep Cycle Systems, this battery is challenging and extremely intelligent. It adapts to high-drain loads and fast-changing conditions, ideal for residential energy systems and mobile rigs.

Its slimline, low-resistance structure means that the battery delivers clean, stable voltage even under full load. It’s safe, silent, and rugged, with advanced BMS protection against overcharging, temperature extremes, and short circuits. The lithium 120-Ah battery is a serious solution for anyone building a reliable, high-capacity energy system.

When to Choose a Lithium 120Ah Battery over Conventional Options

There are many reasons to upgrade to a lithium 120Ah battery, especially when compared to AGM or lead-acid alternatives.

Delivers more usable energy per cycle with less weight
Maintains voltage stability even under high loads
Can be fully discharged without long-term damage
It lasts up to 4x longer than traditional battery types
Requires no water top-ups, venting, or terminal checks

If you want a battery that performs, lasts, and protects itself over time, the lithium 120-Ah battery is a smart, long-term investment.

Smart Energy Storage with the Lithium Ion Battery 120Ah

The lithium ion battery 120Ah from Deep Cycle Systems is designed to simplify energy storage without sacrificing power or performance. Whether building a solar system or prepping for outages, this battery gives you more usable energy with every cycle. Thanks to LiFePO₄ cell chemistry and our proprietary BMS, it delivers clean, stable output—so your devices and appliances stay protected no matter the conditions.

This battery stands out in backup and solar applications because of its safety, efficiency, and long-term cost-effectiveness. The lithium-ion battery 120Ah charges quickly hold a charge for long periods and requires zero maintenance. That means less downtime, less worry, and more energy where and when you need it.

Why the Lithium Ion Battery 120Ah is Ideal for Solar and Emergency Power

Do you need consistent power during blackouts or cloudy stretches? The lithium ion battery 120Ah is your reliable energy partner.

Holds full charge capacity even after extended storage
Discharges safely down to 100% without damage
Rapid recharge from solar panels or AC input
BMS ensures protection against surges and thermal risks
Compact enough to fit tight off-grid or utility installs

When energy matters most, the 120ah lithium-ion battery helps you stay powered, whether you’re living off-grid or riding out a storm.

Lightweight and Efficient 120 Lithium Battery for Mobile Power

Designed with weight, size, and usability in mind, the 120 lithium battery is ideal for mobile power setups. If you travel, camp, or work remotely, you know that a heavy, bulky battery just won’t cut it. This one’s compact, easy to carry, and still delivers high energy capacity—perfect for 4WDs, vans, or backup systems.

Deep Cycle Systems has engineered this battery to work in harsh environments without breaking a sweat. It doesn’t fade under load, doesn’t need maintenance, and integrates easily with your solar, alternator, or mains charging sources. The 120 lithium battery makes your power system more flexible and less demanding.

Using a 120 Lithium Battery in Portable and Residential Applications

The 120 lithium battery is a power solution ready to adapt from portable kits to permanent builds.

Small footprint fits into tight utility drawers or behind seating
Delivers smooth voltage for electronics and appliances
Supports both 12V mobile gear and home backup setups
Lightweight casing reduces strain on travel systems
Pairs well with solar regulators and DC-DC chargers

Whether at home or off the beaten path, the 120 lithium battery gives you quiet, reliable power wherever you go.

Maximise Output with the High-Capacity 120 Amp Lithium Battery

If your energy system requires high output and fast response, the 120 amp lithium battery is up to the challenge. Designed to support large inverters, tools, and devices with heavy surge demands, this battery performs well under pressure without sacrificing safety or cycle life.

Thanks to its advanced BMS and high-discharge cell configuration, it delivers consistent power even when pushed to its limits. The 120-amp lithium battery is ideal for setups where a typical battery might falter—think mobile workshops, emergency gear, or off-grid installations that run heavy equipment.

Applications That Push the Limits of the 120 Amp Lithium Battery

Need serious performance? The 120 amp lithium battery is made for it.

Handles power tools, pumps, and induction loads without voltage drop
Delivers strong surge performance for high-draw devices
Ideal for off-grid solar systems with large inverter setups
Operates in high temps and rough terrain without degradation
It is fully sealed, so it’s safe to install in compact or enclosed spaces

From trades to travel, the 120 amp lithium battery ensures your system has the power to perform under pressure.

Energy You Can Rely On with 120Ah Deep Cycle Battery Technology

When you need stable, long-lasting power for your off-grid system or backup energy supply, the 120Ah deep cycle battery is a trusted choice. It’s designed to release steady voltage over long periods, perfect for continuous-use environments like solar-powered homes, cabins, caravans, or mobile workstations. At Deep Cycle Systems, we’ve built this battery to thrive in tough Australian conditions—heat, movement, and load variations don’t faze it.

With premium LiFePO₄ cell chemistry and an intelligent BMS, this battery delivers energy efficiently and safely over thousands of charge cycles. There are no fumes, no maintenance, and no sudden drop in performance—it just works. The 120Ah deep cycle gives users peace of mind, whether off the grid full-time or relying on backup systems during outages.

Why a 120Ah Deep Cycle Battery is the Smart Choice for Continuous Use

A 120Ah deep cycle battery offers long-term reliability without compromise for systems that cycle energy daily.

Handles full discharges and recharges without damaging cell health
Supports solar charge controllers, inverters, and hybrid setups
Compact enough for RVs, boats, or home battery banks
Stays stable even in hot, dusty, or high-vibration conditions
There is no memory effect, no top-ups—just consistent performance

From daily use to seasonal reliability, the 120Ah deep cycle battery keeps your setup running strong without constant attention.

Rugged and Resilient: The 120Ah Deep Cycle Battery by DCS

The 120Ah deep cycle battery from Deep Cycle Systems isn’t just a power source—it’s a commitment to quality, performance, and safety. Designed using high-grade cylindrical lithium cells and our GEN3 BMS technology, it delivers steady, efficient power for high-demand setups. This battery won’t let you down, whether on the road, on the water, or completely off-grid.

What makes this battery stand out is how well it performs under pressure. Unlike traditional lead-acid units, it maintains voltage even under heavy draw, doesn’t lose capacity when unused, and doesn’t require active maintenance. The 120Ah deep cycle battery is engineered for resilience in both environmental and electrical challenges.

Where the 120Ah Deep Cycle Battery Fits into Modern Solar Systems

Built for integration, the 120Ah deep cycle battery plays well with today’s smart energy setups.

Works with hybrid, off-grid, or grid-tied solar systems
Stores solar energy for night-time or emergency use
Supports high-efficiency inverters and battery monitors
Slim enough for discreet installation, strong sufficient for full-load use
Perfect for residential, mobile, marine, and industrial use

If you’re upgrading or designing your energy system for reliability, the 120Ah deep cycle battery is a powerful, future-ready solution that keeps you in control.

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DOWNLOAD APP (DCS LITHIUM)

DCS Bluetooth Technology powered by DCS Lithium, this APP is only for DCS Lithium batteries which is based on BLE 4.0 technology. Every DCS battery pack comes standard with our detailed battery monitoring via Bluetooth.

This App provides comprehensive monitoring for DCS Lithium batteries, including:

SOC%
Time Remaining
Battery pack voltage, Power & Current
Battery Management MOSFET temperature
Individual Cell Status with balancing indicators.
Connectivity distance up to 10 meters.
Every DCS battery pack comes standard with our detailed battery monitoring via Bluetooth

Learn More About the DCS LITHIUM APP

Click Here to Watch the App Overview Video

Battery Bundles

Sale

Behind Seats 120Ah Super Slim Bundle

Ultra-Safe

Explosion-proof / No leakage

Stable

Low Internal Resistance / Proven Stability

Long Life

Ultra-long cycle life

Guaranteed A Grade

Contracted A Grade cell supply

Availability: In Stock

Sale

Redarc Aux Bundle Deal – 12V 120Ah Super Slim+ BCDC1250D

Ultra-Safe

Explosion-proof / No leakage

Stable

Low Internal Resistance / Proven Stability

Long Life

Ultra-long cycle life

Guaranteed A Grade

Contracted A Grade cell supply

DCS Batteries are the ideal replacement & upgrade from AGM, Gel or other lead acid batteries for any application. DCS gives you the ability to upgrade your current batteries to lithium ion technology that can deliver a minimum of 2500 cycles and has tremendous advantages in weight, performance, reliability and service life compared to that of traditional lead acid batteries.

The REDARC BCDC1250D is a 12V 50A In-vehicle DC to DC battery charger. It features REDARC’s award-winning In-vehicle charging technology, and can charge from Solar and DC inputs simultaneously.

Availability: In Stock

Sale

Super Slim 120Ah + Enerdrive DC2DC Charger

Ultra-Safe

Explosion-proof / No leakage

Stable

Low Internal Resistance / Proven Stability

Long Life

Ultra-long cycle life

Guaranteed A Grade

Contracted A Grade cell supply

The EN3DC40+ is a programmable DC to DC charger featuring separate inputs for engine and solar charging. The solar input is regulated with an MPPT algorithm with a maximum OCV (Open Circuit Voltage) rating of 45V. The charger output is 40A up to 40°C but can be decreased for smaller Ah batteries.

Availability: In Stock

Battery User Guide

Battery Installation Locations

DCS Batteries that are in a sealed traditional style battery case are IP rated 54 unless otherwise specified.

As there is a considerable amount of electronics inside the battery cases, it is important that these batteries are protected from the ingress of particles and water.

IP54 means that there is partial protection against dust & similar particles & protection against splashing water from any direction for a minimum of 10 minutes.
IP54 MEANS THE BATTERIES ARE NOT WATERPROOF

Our DCS Slimline battery range is IP rated to 53 unless otherwise specified.
IP53 means that there is partial protection against dust & similar particles & protection against splashing water up to 60 degrees from the vertical with limited ingress permitted for 3 minutes.
IP53 MEANS THE BATTERIES ARE NOT WATERPROOF.

DCS batteries should be installed and operated in a location that will not exceed the specified operating temperatures.

Make yourself aware of the new requirements that relate to battery storage, IP ratings and venting. Australian / New Zealand Standards (AS/NZS 3001.2:2022)

Do Not

Install DCS batteries underneath a vehicle or caravan, or any other external location that is exposed to the atmosphere unless it is fully contained inside a suitable battery housing that will prevent the ingress of particles & or water. Also, sufficient mechanical / structural protection is needed to prevent damage from rocks and debris during recreational vehicle travel.
Pressure wash or hose your batteries. You can wipe them down with a damp cloth if needed.
Submerge your batteries in any fluids.
Install DCS batteries near high heat sources, e.g. exhaust manifolds or turbo chargers.

Operating Temperatures

Each battery has a designated operating temperature range depending on the cell type used.
Our under bonnet Hybrid battery range (using cylindrical cells) is designed to work in ambient temperatures between -30°C to 110°C. Do not operate outside of this temperature range.

Our 12V 180Ah auxiliary batteries have an operating temperature range of -30°C to 60°C. The DCS BMS will not allow these batteries to operate if the 60°C is exceeded.

The DCS BMS will not allow a frozen Battery that is below 0 degrees Celsius to be charged. Charge will only be allowed when the ambient temperature of the battery cell is back above 0°C.
Discontinue the use of a battery immediately if the battery becomes excessively warm whilst in a resting/standby state.

Please check the specifications for the recommended operating temperatures of your particular battery on the DCS website.

www.deepcyclesystems.com.au

Securing your battery

Your battery must be secured to prevent movement. Restraints must prevent any movement under a pulling force of twice the battery weight.

The recommended hold-down bracket torque is 4 N-m. or 3.5 lb-ft.

Care has to be taken to prevent the battery lid seal/gasket from deforming when securing the battery, which could affect the IP rating of the battery. Do Not over-tighten the battery holding clamps.

Battery Charging

Use only approved Lithium-Iron Phosphate specific chargers for your battery’s nominal voltage, chemistry and maximum charge rate with the correct charging stage voltages.

All DCS 12V cylindrical cell packs to be charged at:

14.4V Bulk

13.5V Float

The DCS 12V 180ah Auxiliary prismatic cell pack (SKU: DCS-12V-180ah) to be charged at:

14.2V Bulk

13.5V Float

Be aware some chargers have fixed charging voltages and cannot be adjusted.

Check the charger specifications for charging voltage levels & charging profiles before purchasing.

Alternator Charging

Our under-bonnet dual battery systems, 80ah Extreme & Slimline range, can be charged directly from the vehicle’s alternator, providing that they are the only battery chemistry being charged.

For example, you cannot parallel a Lithium battery to a lead acid battery and charge from the alternator.

This type of set up has to be separated by using a DC-DC Charger.

If you are parallel connecting batteries together, they have to be the same chemistry, nominal voltage, capacity and age.

Each battery has a maximum charge current listed in the specifications table that should not be exceeded; otherwise, permanent damage could be done to the battery.

When the batteries are parallel connected together, this doubles the amount of current the batteries can be charged at.

For example, our DCS 180ah (2 x 90ah ) dual battery system. The maximum charge current is 80 Amps per battery. So 2 x 80A = 160 Amps. This means you can charge these batteries provided your alternator’s max. output does not exceed 160Amps.

Before choosing a battery, check the maximum output current your alternator can produce and also find out the Cold Cranking Amps (CCA) needed to start your vehicle.

Your factory alternator is generally the best alternator to use, and there is no need for high output aftermarket alternators.

Check the specifications table on the DCS website for the particular battery you are interested in, and look for Lithium Cranking Amps (LCA).

If the LCA meets or exceeds the CCA for your particular vehicle, then the battery is suitable for your vehicle.

Parallel Connected Batteries

Connect Battery 1 Positive to Battery 2 Positive

Connect Battery 1 Negative to Battery 2 Negative ( This cable is extremely important as some vehicles use the chassis as a negative link, which is prone to failing due to corrosion, which causes a high resistance. )

In Balance Wiring

When you have batteries that are wired in parallel, as described above, it is good practice to wire your loads and inputs in balance.

What this means is, for example, to connect loads & inputs positive to the first battery e.g. Battery 1 and the negative loads & inputs to the last parallel connected battery e.g. Battery 2.

This is important when using an inverter that can have a high current draw so that they evenly draw from the parallel connected batteries.

Storage

If you are not going to be using the battery for some time, charge the battery fully to a 100% state of charge using the correct charging profile and voltages.

Disconnect everything off the battery terminals, and it can be left in this state for up to 3 months.

After 3 months, cycle the battery, fully discharge the battery (11.5 volts), then fully charge the battery, and the battery can then be left in this state for another 3 months.

Do Not

Use a lead acid charger / maintainer on a Lithium battery.

DCS LFP App

Every DCS LFP battery pack comes standard with detailed battery monitoring information via Bluetooth. (BLE 4.0 Technology)

The app can be downloaded to Android or iOS devices that are Bluetooth enabled.

Comprehensive battery monitoring information for DCS LFP batteries include

SOC%. (State Of Charge)
Battery pack voltage, Current & Power
Time Remaining
Individual Cell Voltage Status
Battery Management MOSFET temperature
Connectivity distance up to 10 metres.

Renaming Your Batteries Using The App

Open the DCS LFP app and connect to the battery.
Tap on the three horizontal lines on the top right hand corner of the screen.
Input Password. 736263 > OK
Name ………… > OK
Refresh the battery list by tapping the circular arrow.
Select custom and your battery will now appear in this section.

Modifications

Do not attempt to alter, modify or repair any part of the battery.

Any modifications to the battery will void your warranty.

Fully Discharged Battery

The BMS will emergency open the circuit of the battery terminals to protect the cells. Typically, you will see 3 - 4 volts across the battery terminals when using a multimeter. The BMS needs a 12V supply with at least 1A of current to release and wake up from a cell emergency protection state.

Most mains chargers with a lithium profile will do a slow recovery charge, as will most solar regulators. Some chargers on the market today that are advertised as ‘lithium’ compatible still don’t have the firmware to do a slow recovery charge to release BMSs. If you have a charger that will not wake up the BMS, the easiest way to wake it up is to connect an unregulated solar panel directly to the battery terminals; however, ensure all loads are disconnected before you do this. Having said that, every system should have a suitable low cut-off voltage to shutdown loads/accessories so that the batteries are not fully drained.

“Batteries cannot be left flat/empty; if the low voltage cutoff is triggered, the battery pack should be fully charged as soon as possible. If access to a suitable charger is not possible, disconnect all loads from the battery terminals. The warranty will be void if the battery pack has been left in a low voltage cutoff state for longer than 14 days.”

The most important thing is to isolate everything from the battery terminals, as cables/loads connected to the terminals cause more power drain as the FET gates have to remain closed to cull the accessory standby loads connected to the battery pack + offset BMS standby power consumption.

Incorrect State of Charge Due to a Synchronisation issue:

The state of charge is a calculated value by the BMS and will need to be reset (synchronised) every now and then.

The synchronisation process is automatic and is performed each time the battery is fully charged. The battery monitor (BMS) determines that the battery is fully charged when all 3 "charged" conditions have been met. The "charged" conditions for 12V batteries is:

Charged Voltage (> 14.0 Voltage)

Tail current (4% of battery capacity)

Charge detection time (1 minute)

Electrical Installations Standard ( AS/NZS 3001 . 2 : 2022 ) For Transportable Structures which includes Recreational Vehicles, Caravans etc.

Please note AS/NZS 3001 is made mandatory by electrical legislation in each state and territory.

The new standard includes requirements for “connectable electrical installation batteries” covering any battery that is installed with the primary purpose of supplying the living / accommodation features of a transportable structure, which includes recreational vehicles and caravans etc.

Below is a brief summary of some of the new requirements.

Lithium - Ion Batteries

The location must be appropriate to ensure that the battery operates within the manufacturer’s defined operating temperatures and IP rating.
Batteries must be located in a position that prevents any vented gases from entering a habitable area of the recreational vehicle. Any vented gases have to be vented externally from the vehicle. ventilation openings have a minimum vent area requirement, which is calculated based on the ratings of the battery. Any opening into the interior (habitable area) must be provided with an air seal.
Any metallic service lines (eg. Gas, Diesel, Water etc.) located near the battery must be at least 300mm. clear of the battery terminals or must be shielded with dielectric material to prevent against short circuits.
A battery must be secured to prevent movement. Restraints must prevent any movement under a pulling force of twice the battery weight.

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FAQ

CELL SAFETY INFO - Why LiFePO4 (LFP)?

Lithium Ferrophosphate (LFP) is a flame retardant, stable, safe and proven cell chemistry that has a very good energy density around 325 Wh/L. This cell chemistry can be engineered for various applications by adjusting the ratio of elements to provide high performance characteristics. E.g. the DCS marine battery range runs 2C cells, which means our little 75Ah battery will discharge comfortably at 75Ah x 2C = 150A. The DCS 80Ah Extreme runs 10C cells which means the 80A can comfortably discharge at 80Ah x 10C = 800A but is of course limited to lower currents due the the Battery Management System.

LFP also has very good cycling durability between 2,000 ~ 12,000 cycles can be achieved depending on how well the cells are managed, and the lowest rate of capacity loss (aka greater calendar-life) compared to other lithium cell chemistries.

WHY YOU CANNOT USE A VSR BETWEEN TWO DIFFERENT BATTERIES CAPACITIES & CHEMISTRIES?

Battery cells are simply a bunch of resistors with the ability to store energy. A 100Ah battery pack has a different resistance characteristic compared to a 50Ah battery pack, that theoretical difference in resistance is 2:1. So if you connect a 100Ah battery in parallel to a 50Ah battery there is no way for these two batteries to equalise and therefore you can’t charge them correctly. So for example connecting a 60Ah calcium starting battery to a 120Ah AGM via a VSR (Voltage Sensing Relay) you cannot charge both batteries correctly and from that day onwards you are prematurely destroying both battery packs. Same theory applies with lithium’s it’s still a battery pack.

What’s the solution? A DC-DC charger, you now have a permanent point of isolation (meaning that both batteries are never connected to each other in parallel). The DC-DC charger takes the surplus power from battery A (engine) and chargers battery B (aux/house). This device now allows any battery capacity and or chemistry to be used.

What if both batteries are the same, can I run a VSR between exactly the same two batteries?

Yes you can, but lithium’s have a different voltage curve, so you would still need to use a programmable VSR to dial them in correctly. You would also need to ensure the batteries are programmed to never exceed a 10%SOC variance, any larger and you risk damaging the BMS's. These devices also draw a lot of power when engaged to so it’s best to run the two batteries in permanent parallel and run a load disconnect instead of a VSR.

The advantages of the lithium battery cell chemistry

Lithium battery cells have a super low resistance so are very easy to charge and very efficient. This level of efficiency means you can charge them at very high C rates. For example if you look at the charge rate of a 100Ah AGM battery the recommended charging current will be around 25A, which is a 0.25C charge rate. If you consider the DCS 12V 100Ah Lithium battery it can be charged at up to 70A which is a 0.70C charge rate. This means you no longer need to consider DC-DC chargers as you can connect our batteries directly to high power charging devices such as suitable alternators, or large buck boosters. For example our popular dual 90Ah battery system for boats and 4WD vehicles, can be connected to alternators up to 160A.

WHY CAN DCS BATTERIES BE CONNECTED IN PARALLEL WITHOUT ANY EXTERNAL COMMUNICATION SYSTEM?

Because our batteries are internally voltage regulated and because our BMS has such a high sustainable peak discharge current they will do an amazing job of equalising very quickly.

WHAT HAPPENS IF I FULLY DISCHARGE MY BATTERY TO EMPTY?

The BMS will emergency open circuit the battery terminals to protect the cells. This means there is no longer any resistance in the system. The BMS needs a 12V supply with at least 1A of current to release and wakeup from a cell emergency protection state.

Most mains chargers with a lithium profile will do a slow recovery charge as will most solar regulators. Some chargers on the market today that are advertised as ‘lithium’ compatible still don’t have the firmware to do a slow recovery charge to release BMS’s. If you have a charger that will not wakeup the BMS, easiest way to wake it up is to connect a unregulated solar panel directly to the battery terminals, ensure all loads are disconnected before you do this. Having said that every system should have a suitable low cut off voltage to shutdown loads/accessories so that the batteries are not fully drained.

"Batteries cannot be left flat/empty, if the low voltage cutoff is triggered the battery pack should be fully charged as soon as possible. If access to a suitable charger is not possible, disconnect all loads from the battery terminals. The warranty will be void if the battery pack has been left in a low voltage cutoff state for longer than 14 days."

Most important thing is to isolate everything from the battery terminals, as cables/loads connected to the terminals causes more power drain as the FET gates have to remain closed to cull the accessory standby loads connected to the battery pack + offset BMS standby power consumption.

BATTERY MONITOR SETTINGS

Use the following settings:

Charged voltage 14.0V
Tail current 4%
Charged detection time 1min
Peukert 1.05
Charge efficiency 98%
Current threshold 0.1A
C rates: refer to the battery pack capacity

WHAT IS THE BEST STATE/CHARGE TO STORE THESE BATTERIES ?

Fully charge to 100% isolate everything from the terminals and leave for max 3 months and then cycle (fully discharge and fully charge) and leave again for 3 months etc…. Minimum 4 cycles per year to not effect the cells capacity.

WHAT SOC DO MODERN SMART ALTERNATORS TYPICALLY CHARGE BATTERIES TO?

The reason many factory batteries fall over after 9/12 months is because modern/smart alternators typically drop the alternators voltage output to 13.5/13.6V. This voltage is not high enough to charge wet/calcium/lead acid batteries so from the getgo they are destined to fail prematurely. They are typically under charged to around ~80%SOC at these voltages.

So what happens when DCS Hybrid batteries are connected to smart alternators? Exactly the same thing they get charged to around the same 80%SOC. However because LFP has no memory effect that's perfectly fine. By only charging to 80% you are further improving the service life of our batteries. It's no not necessary to charge our batteries over 80%SOC. The only advantage is that you give the BMS a chance to detect full charge voltage and calibrate the SOC readout. So try to plug into mains once a week to fully charge your batteries, especially if your not running any fixed solar supply.

RECOMMENDED CHARGER SETTINGS FOR DCS 12V BATTERIES:

All DCS 12V cylindrical cell packs can be charged as follows:

Bulk: 14.4V
Float: 13.5V

The DCS 12V 180Ah Auxiliary prismatic cell packs (SKU: DCS-12V-180Ah) need to be charged as follows:

Bulk: 14.2V
Float: 13.5V

SOC% Out - How to Reset?

When the battery pack is discharged down to 11.50V the BMS resets to 0%SOC and now is placed in a relearning state - the pack must be fully charged continuously without stopping to calibrate again. Charge it on a mains charger to 14.60V.

Depending on the usage pattern, best to fully cycle the batteries once every 3 months to give the cells a refresh. To fully cycle a 12V pack discharge to 11.50V and charge to 14.60V.

BMS & CMS

Here at DCS, designing lithium batteries is not only our bread and butter, but we love this safe, stable, robust, and high-performance cell chemistry so much that we decided to develop our own range of Battery and Cell Management Systems in 2015.

DCS Battery Management System:

What was the objective? Well, the reason we embarked on this project was that all the basic Chinese designed BMS’s are just protection boards, and it is hard to call them a BMS when they don’t do any cell balancing or provide any means of programmability for various parameters and cell control. A lot of Battery Management Systems that we have tested were using inferior PCB engineering design techniques and poor components. That means continuous performance above 100A was more or less impossible, and reliability was also questionable when pushing above 100A with those Battery Management Systems.

Our key BMS objective was to develop a high-performance 200A BMS that could do;

200A continuous operations using high-quality components
To have a minimal increase in temperature at peak output current (as these circuit boards are installed inside battery packs, limiting internal heat build-up that is crucial for the longevity of the battery cells).
Designed for engine cranking applications, it has to deliver a minimum of 1200LCA’s for 10 seconds (because of the limited voltage drop with suitable lithium cells, it’s very easy to crank over modern engines. Most engines will start in under 1sec, so 10 seconds is plenty). CCA’s don’t apply to lithium batteries as this standard was developed for lead-acid batteries and needed to deliver 30 secs of cranking amps. When a lithium battery is controlled via a BMS, the correct terminology is LCA = Lithium Cranking Amps based on delivering 10 secs of cranking amps.
Suitable for high temperatures applications, e.g. engine compartments. It will be stable up to 180 degrees C.
Bluetooth and WiFi connectivity in order to develop a comprehensive app platform
Pass MIL vibration testing standards (to open up the development of batteries for just about any application).

In a nutshell, the design needed to be tough and reliable for those who use them in the field with no room for error. The construction materials, coating and surfaces, assembly techniques are critical in designing a reliable system. After submitting our brief to all major leading manufacturers in Europe, Japan, USA and Korea, we assessed their expertise and ended up working with a leading and well known Japanese semiconductor manufacturer.

This is a typical Chinese 100A 4S BMS design

This is the DCS 4S 200A BMS

After three years of development, in early 2018, we were satisfied with the circuit board stress testing and released the first batch of our newly developed BMS’s right across our entire 4S (12V) & 16S (48V) battery range. At the same time, we hired an app development team to start working on the software integration to launch our first app platform. The first GEN1 BLE DCS BMS’s that featured Bluetooth chips were launched in OCT 2019. The app platform required a lot of tweaking both on the hardware and software front, and our GEN2 BMS’s were released in mid-2020 along with a more stable app platform with a new design scheme. Our latest GEN3 BLE BMS’s had been released in JAN 2021. The accuracy and stability of the DCS LFP App monitoring system is now very mature and refined. Some additional features had been added along with the ability to create custom battery names. We can produce our DCS BMS technology in any continuous rating range from 10A to 200A with our comprehensive BLE DCS LFP App platform.

DCS Cell Management System:

Having developed such an industry-leading and reliable BMS, it made no sense to combine the cell balancing system together with the BMS. So with our many years of experience in designing and maintaining lithium batteries, we have developed a stand-alone CMS to compliment our BMS. CMS? What? OK, so there are two ‘theories’ of cell balancing in the lithium world passive and active. Passive balancing is a cheap inferior method of cell management as it can burn resistors in an attempt to bleed cell strings. In contrast, active cell balancing is a more complex and efficient balancing technique that redistributes charge between battery cells during the charge and discharge cycles.

Passive balancing has two fundamental setbacks;

Heat: We don’t want unnecessary heat build-up inside a battery pack. The less internal heat, the lesser the impact on the battery cells over time
Resistors have a limited service life, and once they fail game over, you have no cell management. But more importantly, they can fail in such a way in which they will keep drawing power and eventually destroy the cells.

Active balancing is the only way to manage lithium cells correctly. There are many ways to design an integrated circuit (IC) to actively manage cell strings. At DCS, we have tested well over 10 different methods of active balancing IC’s over the years and, in the end, again decided to develop our own active management circuit boards with the best-combined techniques based on our stress testing. Our in house PCB design engineer Max, designed our circuit boards to again meet the following criteria:

High current movement (our latest boards now achieve 3.7A dynamic movement per channel)
Thermal management to ensure the boards remain reliable in harsh environments
Be able to withstand maximum current and thermal loads to ensure long term reliability
Fail-safe design, if any component fails, it won’t compromise the battery pack (not consume power from the battery cells)

This is the DCS 16 channel CMS

There are, of course, some other software features and parameters, which we can’t disclose on this page to the public, as well as some very fancy hardware. But what our latest 04 channel and 16 channel CMS’s do is they can easily manage up to 1000Ah battery banks. So, for example, if you wanted to use our 16 channel CMS’s you could run a 51.2V 1000Ah single battery pack, which would be 51.2kWh in size! The DCS 15kWh batteries are just shy of 300Ah in capacity, so one can only imagine the tight CMS control these batteries are under, and that’s why we back them with a 10 year / 80% capacity warranty.

The DCS 16 channel 59.2A active cell balancing system is so powerful that it will change the battery storage market forever. With this system, the lithium market will continue to dominate for the foreseeable future. Of course, all DCS batteries now feature both our BMS & CMS circuit boards.

We design all our own PCB hardware and the circuit boards are tested to withstand a minimum of 10 years of severe abuse. This video is the MIL-STD 810G Method 514.6 which includes 4 procedures for different modes of vibration.

How to wire batteries correctly

How to Wire Batteries Correctly

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