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5 Year Warranty

Australian Made

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30+ Installers Australia-Wide

Ultra Slim Lithium Battery 400Ah

$3,990.00

The 400Ah Ultra Slim Battery is designed to enhance your adventures by fitting effortlessly into the tightest spaces—behind seats, under false floors, or in canopy walls—without compromising on power or performance. Power your induction cooker, tools, fridge, Starlink and more with our Ultra Slim Lithium Battery.

LEARN MORE

5 Year Warranty

Australian Made

Lifetime Customer Support

30+ Installers Australia-Wide

BUILD YOUR SETUP

Capacity: 400AH

ADD A BATTERY CHARGER

Redarc BCDC Core 40

$430.00 $480.00

REDARC Alpha Series Charger With RedVision Monitor - 50 AMP Charger

$3,999.00

REDARC Alpha Series Charger With RedVision Monitor - 75 AMP Charger

$4,899.00

REDARC Alpha Series Charger With RedVision Monitor - 100 AMP Charger

$5,899.00

ADD A BATTERY MONITOR

Victron Smartshunt 500A

$125.00 $135.00

Redarc Smart Battery Monitor

$270.00 $280.00

Ultra Slim Lithium Battery 400Ah

From $3,990.00

Highest Performance.

Smallest Footprint.

STAY OFF-GRID FOR LONGER

  • Made in Brisbane
  • 5 year warranty
  • Individually bench tested
  • Lightweight aluminium enclosure
  • Premium A-grade automotive LiFePO4 cells
  • High current BMS
  • High discharge rate
  • Active balancer

POWERING YOUR...

STARLINK

240v Inverter

FRIDGE

Induction Cooker

Air Compressor

Computer

Camera

Lights

Unmatched Safety & Performance

To maximise safety and performance, this battery is crafted with A-grade automotive LiFePO4 lithium cells. LiFePO4 is considered the safest type of lithium battery and is ideal for demanding environments ensuring safety and reliability.

Power That Fits Anywhere

Our Ultra Slim range of batteries was designed to fit in extremely compact spaces including behind the seats, under false floors or inside canopies. Despite this, the high current BMS and premium LiFePO4 cells ensure there is no compromise in performance.

Built to Last a Lifetime

Our custom aluminium enclosure is designed to reduce the battery's footprint and protect the cells. All components are insulated against vibration to protect your setup against corrugations and the effects of remote travel giving you confidence to explore without limits.

Built to the Highest Standard

To protect your battery we’ve equipped it with a Heltech BMS and active balancer; the BMS safeguards against overheating, over-discharge, and short-circuiting, while the active balancer maintains optimal performance by managing and protecting individual cells.

Backed to go the Distance

We take pride in the quality and craftsmanship of our batteries, which is why we offer a full 5-year warranty to give you peace of mind. Each battery is individually bench-tested so you can trust it to perform no matter where your adventures take you.

Australian Made

Certified Australian Made, our batteries are built in Brisbane and meet the highest standard of craftsmanship. Your purchase not only ensures you’re receiving a premium product but also supports the local economy and helps to keep manufacturing in Australia.

Engineered for Adventure

Designed by our team of off-roading enthusiasts, our lithium batteries are built to power your off-grid adventures.

TECH SPECS & SIZE

CAPACITY:400AH
CONSTANT DISCHARGE:380 AMPs
PEAK DISCHARGE:1800AMP Protection
CONSTANT CHARGE:100 AMPs
PEAK CHARGE:200 AMPs
DIMENSIONS:115mm H x 373mm W x 580mm L
WEIGHT (KG):38kg
OPERATING TEMP:-20°C – 60°C
TERMINALS:M10 terminals
CHARGE VOLTAGE:14.2v – 14.6v
ABSORPTION/FLOAT:13.4v – 13.6v
CUT OFF VOLTAGE:10.5v
NOMINAL VOLTAGE:12.8V

COMPARE ULTRA SLIM BATTERIES

A table comparing the facets of 8 products
Facet
Ultra Slim Lithium Battery 100Ah
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Ultra Slim Lithium Battery 200Ah
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Ultra Slim Lithium Battery 280Ah
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Ultra Slim Lithium Battery 310Ah
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Ultra Slim Lithium Battery 400Ah
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Ultra Slim Lithium Battery 450Ah
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Ultra Slim Lithium Battery 550Ah
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Ultra Slim Lithium Battery 620Ah
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Capacity
Capacity
100AH
200AH
280AH
310AH
400AH
450AH
550AH
620AH
Constant Discharge
Constant Discharge
180 AMPs
200 AMPs
330 AMPs
330 AMPs
380 AMPs
380 AMPs
380 AMPs
380 AMPs
Peak Discharge
Peak Discharge
700AMP Protection
700AMP Protection
850AMP Protection
850AMP Protection
1800AMP Protection
1800AMP Protection
1800AMP Protection
1800AMP Protection
Constant Charge
Constant Charge
50 AMPs
100 AMPs
100 AMPs
100 AMPs
100 AMPs
100 AMPs
100 AMPs
100 AMPs
Peak Charge
Peak Charge
100 AMPs
200 AMPs
200 AMPs
200 AMPs
200 AMPs
200 AMPs
200 AMPs
200 AMPs
Dimensions (mm)
Dimensions (mm)
55mm H x 300mm W x 490mm L
60mm H x 373mm W x 580mm L
82mm H x 373mm W x 580mm L
82mm H x 373mm W x 580mm L
115mm H x 373mm W x 580mm L
115mm H x 373mm W x 580mm L
150mm H x 373mm W x 580mm L
150mm H x 373mm W x 580mm L
Weight (kg)
Weight (kg)
14kg
22kg
25kg
25kg
38kg
38kg
58kg
58kg
Operating Temp
Operating Temp
-20°C – 60°C
-20°C – 60°C
-20°C – 60°C
-20°C – 60°C
-20°C – 60°C
-20°C – 60°C
-20°C – 60°C
-20°C – 60°C
Terminals
Terminals
M8 terminals
M10 terminals
M10 terminals
M10 terminals
M10 terminals
M10 terminals
M10 terminals
M10 terminals
Charge Voltage
Charge Voltage
14.2v – 14.6v
14.2v – 14.6v
14.2v – 14.6v
14.2v – 14.6v
14.2v – 14.6v
14.2v – 14.6v
14.2v – 14.6v
14.2v – 14.6v
Absorption/Float
Absorption/Float
13.4v – 13.6v
13.4v – 13.6v
13.4v – 13.6v
13.4v – 13.6v
13.4v – 13.6v
13.4v – 13.6v
13.4v – 13.6v
13.4v – 13.6v
Cut Off Voltage
Cut Off Voltage
10.5v
10.5v
10.5v
10.5v
10.5v
10.5v
10.5v
10.5v
Nominal Voltage
Nominal Voltage12.8V12.8V12.8V12.8V12.8V12.8V12.8V12.8V

Proudly Certified as Australian Made

Built in Australia, for Australia. We know the toughest tracks demand the highest quality gear. Purchasing this battery not only supports the Australian manufacturing industry, but ensures your battery is of the highest quality.

LITHIUM BATTERY FAQS

Can I swap my AGM Deep Cycle Battery for a Custom Lithium Battery?

The possibility of swapping your AGM battery for a Custom Lithium Battery primarily depends on your current charging setup. AGM and lithium batteries have distinct charging cycles and chemical properties. Lithium batteries, while lighter and more efficient with a longer lifespan, require more precise charging profiles to prevent damaging the battery and to prevent overcharging and avoid potential safety hazards.Before proceeding with a swap, it’s crucial to verify that your existing chargers and related equipment are compatible with lithium batteries. Ensure to consult the manuals for your DC-DC charger, solar charge controller, and 240V charger, among others. These should support the specific needs of lithium batteries to facilitate a safe and effective transition from AGM to lithium technology.

What size DCDC charger do I need for my lithium battery?

All the DC-DC chargers we offer are fully compatible with Custom Lithium Batteries. Whether you choose a charger with a built-in MPPT solar regulator or a straightforward DC-DC charger, you’ll find an option that suits your needs.The choice between smaller and larger DCDC charger models largely depends on your desired charging speed. For our larger batteries, we recommend opting for a larger DC-DC charger to ensure more efficient recharging. However, even our smaller batteries can handle a robust 40A charger for quicker charging. Alternatively, using a smaller DCDC charger, such as 25A or 30A, is also viable but expect slower charging times.If you are considering a charger from a third party or planning to use an existing one, make sure the lithium DCDC charger is configured to support a 13.4-13.6 volts absorption/float charge and a bulk charge of 14.2-14.6 volts to ensure optimal charging performance and battery health.

What charging profile should I use to charge my lithium battery?

For optimal performance, specific charging parameters need to be adhered to. The battery requires a charge voltage between 14.2V and 14.6V for effective charging. The absorption and float voltage should be maintained between 13.4V and 13.6V to ensure the battery is charged safely without risking overcharge.If your charger, like the Victron 12-12/30, offers a LiFePO4 setting, it’s advised to use this option to align with the battery’s requirements. This setting ensures that the charger outputs the correct voltage profile and maximizes the battery’s performance and longevity.

Are Custom Lithium Batteries IEC-62619 certified?

All Custom Lithium batteries are made with high-quality IEC-62619 certified components and meet the AS/NZS 3001 recommendations.

How do I restart a flat Lithium Battery?

There are two main methods to restart an Ultra Slim Lithium Battery that has run flat:

Method 1: The simplest method involves using a lithium-compatible 240V charger with a ‘power supply’ mode. Connect the Ultra Slim Lithium Battery to the charger, set it to ‘power supply’ mode, and allow it to charge until full. This method helps wake up the battery and continue charging.

Method 2: If you do not have access to a 240V charger, you can restart your battery using another 12V battery with similar voltage and capacity:

  • Equip yourself with jumper leads with positive and negative clamps.
  • Position the two batteries next to each other, ensuring they do not touch.
  • Connect the positive clamp of the jumper leads to the positive terminal of both batteries.
  • Connect the negative clamp to the negative terminal of both batteries.
  • Activate the vehicle or power source equipped with a DC-DC charger to start the charge.
  • Once charging is confirmed, carefully disconnect the jumper leads, starting with the negative.

If your Ultra Slim Lithium Battery remains unresponsive after an extended discharge period, it may require servicing. Please return it to Custom Lithium for a professional assessment. It is highly recommended to fully charge the battery after a successful reset to ensure optimal performance.

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Ultra Slim Lithium Battery 400Ah

$3,990.00

Dimensions

115mm H x 373mm W x 580mm L

Weight (kg)

38kg

Continuous BMS AMPs

380 AMPs

Peak Discharge

1800AMP Protection

Constant Charge

100 AMPs

Peak Charge

200 AMPs

Cut Off Voltage

10.5v

Absorption/Float

13.4v – 13.6v

Charge Voltage

14.2v – 14.6v

Terminals

M10 terminals

Operating Temp

-20°C – 60°C
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