SKU: DCS-12V-75Ah
DCS 12V 75AH (LITHIUM)

FREE DELIVERY AUSTRALIA WIDE

12V 75AH Lithium Ion Battery | Deep Cycle | Engine Starting

DCS Batteries are the ideal drop-in 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 traditional lead-acid batteries.

Backed by a 4 year replacement warranty.

Availability: Out of Stock – Back in Stock Late June

$999.00 AUD

From $133.72 a fortnight withInfo

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The DCS 75Ah batteries come in a small footprint and pack a big punch with a 2C discharge rate, which means these little batteries can run a 1800W inverter!

All DCS batteries now feature our comprehensive Bluetooth System available on both Android and Apple operating systems that shows a lot of cool things.

  • 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 (using impedance tracking – the App learns the SOC after the first 10 cycles)
  • Battery pack voltage and cycle count
  • Amp meter – showing charge and discharge current
  • 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.
  • The SOC estimate is accurate on single batteries, the more batteries that are expanded in parallel, the less accurate the SOC becomes.
  • This free application provides the perfect tell-tale about the battery packs’ state of health as it ages
  • Assists installers & integrators to quickly diagnose any system issues
Specifications:
Nominal Voltage 12.8V
Nominal Capacity (1Hr) 75Ah
Case Dimensions (L x W x H) 260mm x 169mm x 175mm
Weight 8.60 Kgs
Cycling voltage 11.5 ~ 14.6V
Charge voltage 14.0 ~ 14.6V
Float Voltage 13.5 ~ 13.7V
Maximum Charge Current 75A
Recommended Charge Current ≤50A
Maximum Discharge Current ≤150A
BMS (built in) Automatic cell balancing, over discharge/charge
Cell Chemistry DCS 3.2V 5.0 – 7.2Ah Cylindrical (LifePO4)
Cycle Performance 2500 Cycles @ 100% DOD
LCA 750
Ingress Protection IP54
Case ABS (flame retardant plastic)
Operating temp Range -30 to +80 degrees C
Terminals Top Mount M8 Stainless steel / Copper
Parallel Connections Only YES
Series Connections No
Warranty 4 years | 3 years under bonnet

DCS High Performance 2C Charge & Discharge Curves

DOWNLOAD APP (DCS LFP)

DCS Bluetooth Technology powered by DCS LFP, this APP is only for DCS LFP 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 LFP 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 LFP APP

Click Here to Watch the App Overview Video

HIGH-QUALITY AND RELIABLE 75AH LITHIUM BATTERY FOR POWER BACKUP

Research and innovation in the battery world lead to a new generation battery version, improving backup battery banks’ stability. The earlier battery storage devices were bulky, inefficient and required continuous maintenance checks. The earliest battery bank used acid or distilled water-filled through its vents, and they need to be placed in a ventilated place to avoid any problem. The latest 75ah lithium battery by Deep Cycle Systems is all you need to power your electrical appliances, either connected with a grid or going off-grid.

Lithium-Ion Battery Technology

The flooded-acid battery is still the most in service as it has been in service for over a century and a half. Since its invention in the early 1990s, the feature-rich lithium battery technology has captured a major market share due to its compatibility with a variety of applications. The modern features of a lithium-ion battery make it 5x efficient. It’s not a wonder that lithium batteries are part of almost every energy-hungry application with small to large power devices including, smartwatches, mobile phones, laptops, power tools, cameras, vehicles, military installations, medical equipment, aerospace, mobile food shops, media vans, campervans and solar systems.

Deep Cycle Battery

Lithium technology is reliable and offers deep-cycle lithium-ion battery units to either power individual electronic devices or power the entire home. As our name suggests, we are the best manufacturer of Deep Cycle Batteries built for heavy-duty performance 24/7. Our technology is robust enough to withstand the tough Australian weather conditions of the desert, so installing lithium batteries in any part of the country isn’t challenging. You can use a lithium battery as a starter battery due to its ability to provide high initial power and later use it as a regular deep cycle battery for power backup.

Maintenance-Free Battery

You need not worry about maintenance checkups, as our batteries are maintenance-free. Lithium batteries are free from adding up distilled water regularly to save battery cells from damage, like flooded acid batteries.

Virtual Control

You are empowered to monitor and control various battery parameters using your mobile phone by connecting the power system via Bluetooth. Using a SmartSolar MPPT charge controller for your lithium battery, you have access to observe the battery performance, i.e. ampere-hours produced and consumed, can connect or disconnect loads and battery in certain conditions, i.e. under and overvoltage. The SmartSolar also provides safety to the battery in case of the high temperature of battery cells.

We are concerned about your safety; our battery production and other energy products have passed all the tough and challenging exams, certifications and benchmarks set by relevant safety departments. We use a three-stage charging method for our lithium batteries, including bulk charging, absorption, and float mode. Our MPPT charger ensures maximum power points tracking, resulting in a quick battery charge. MPPT is best for extracting every bit of available solar energy; it is the best and the only option for high efficiency even in the cloudy and winter season.

Battery Ampere Hours

Ampere hours are the capacity you want from your battery bank to power a certain amount of load. The ampere-hours of a battery depend on some circumstances, i.e. total load to power, backup time in hours and battery voltage. We can calculate the battery ampere-hours by multiplying the total load by hours and dividing it by battery voltage. For example, if you want to power devices of 225 watts for four hours with a 12v battery, you need a 75ah lithium battery to operate the devices smoothly.

75ah deep cycle batteryEnjoy Thousands Of Life Cycles Of A 75ah Deep Cycle Battery

The lead-acid batteries are recommended for a maximum of 50% discharge, which means that you can’t utilize the full potential of a lead-acid battery. A 75ah deep cycle battery will constantly provide you with more power without dropping voltage levels. That is the main reason for the quick success of such battery banks.

Batteries are crucial when using power, especially for portable devices, or when you want energy backup for your home or work site. The technological advancement in batteries allowed us to choose from a range of battery packs. A deep cycle battery has become the majority’s demand due to its unmatchable features compared with a traditional lead-acid battery. Deep cycle batteries are replacing outdated technology. We can find them in stock, where the need for small, medium and extensive power usages are required, i.e., mobile devices, laptops, power tools, vehicles, marine boats, aerospace, and military projects. The reason for the exponential popularity of deep cycle batteries is the ability to provide a deep discharge of up to 90%, which was impossible a couple of decades ago.

Deep Cycle Systems is a leader in the Australian energy market, serving families with affordable yet reliable and premium quality energy products to provide the best user experience. Our battery stockpile includes top-notch deep cycle battery collection meant for a longer life span that could be a decade. Our customers are happy that they got battery banks that can withstand harsh weather conditions, i.e., can operate in a temperate range between 5 to 60 degrees Celsius. These systems are maintenance-free to offer you a decade of service life.

Our deep cycle battery packs are lithium-based, known for their quality, deep discharge ability, quick charge time, and low self-discharge with under 3% of self-discharge during a month (depends on charge status).

75ah deep cycle batteryWhat is a Charge Cycle?

A charge cycle refers to a procedure where a battery needs a charging aid and, after a full charge, discharges it to power certain AC loads. The charge cycle indicates the expected battery life. Typically, a deep cycle battery has thousands of charge cycles that make years of expected life in given circumstances. A deep discharge means using the battery’s full potential to utilize maximum output from it.

Voltage Level

A deep cycle battery is rated in two terms, i.e., ampere-hours and voltage level. A 75ah deep cycle battery tells the current supply to AC loads, while the voltage level describes the range of applications it can support. Typically, a 12v battery is used for most electrical appliances at home or in commercial use. 24v and 48v batteries are more common for motor vehicles, RVs, electric vehicles, and where more power is required for more significant projects.

Contact Us

Deep Cycle Systems has been meeting the energy needs of Australian families for years. The trust of our customers is our pride; many of our new customers are referred by loyal clients. We are a team of experts in providing state-of-the-art energy solutions. Our products are manufactured to provide a longer life span without the need for regular maintenance visits that could dent your budget. Our products require initial installation usually, and you will enjoy the benefits for years. Give us a call at 1300 795 327 or write an email to us at info@deepcyclesystems.com.au.

Battery Terminal Configuration

RHP – Right Hand Positive, LHP – Left Hand Positive

FAQ

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.

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.

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. However these devices draw a lot of power when engaged to so it’s best to run the two batteries in parallel and run a load disconnect instead of a VSR.

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.

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.

The BMS will 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 signal with at least 1A of current to release and wakeup from a cell 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.

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

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.

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 connect to smart alternators? Exactly the same thing thry 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.

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;

  1. 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
  2. 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

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. However these devices draw a lot of power when engaged to so it’s best to run the two batteries in 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 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 signal with at least 1A of current to release and wakeup from a cell protection state. Most mains chargers with a lithium profile will do a slow recovery charge as will most solar regulators. Some chargers in 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.

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.