Custom Lithium 280Ah Ultra Slim Lithium Battery
This is an estimate only. Actual delivery times can vary with stock availability, courier delays, weather, public holidays and your location.
Big Power In A Small Package - The Custom Lithium 280Ah Ultra Slim Battery Delivers
Running out of space but still need serious juice? The 280Ah Ultra Slim Lithium Battery is an absolute ripper for utes, canopies, and tight installs where every millimetre counts. Don’t let the slim profile fool you, these batteries packs a punch, with enough grunt to run fridges, lights, and even a decent inverter without breaking a sweat. Built tough, built smart, and built right here in Oz.
Power your adventures without wasting precious space. Get the Custom Lithium 280Ah Ultra Slim Lithium Battery today and enjoy reliable, hard-working power wherever the road takes you.
Fit more power where it shouldn't fit and add one to your cart today.

Why The Custom Lithium 280Ah Ultra Slim Lithium Battery May Be Right For You:
- Don't stress about your battery whilst you're driving through those bumpy outback roads. Safety is Custom Lithium's number 1 priority. The 280Ah Ultra Slim Lithium Battery is integrated with A-grade automotive LiFePO4 lithium cells meaning you can rest assured that your battery will be fine, even if your tires are getting a working over.
- Big bulky batteries are a thing of the past, ultra slim batteries are gaining in popularity, and for good reason! The sleek design of Custom Lithium's Ultra Slim batteries allows them to fit into your caravan, 4x4s and boats seamlessly. Light, slim but powerful, the ultra slim battery is a great alternative for when you're short on space.
- Worried about your battery sliding all over the place? Worry no more as mounting Side Rails are included in this package. Simply mount your new ultra slim battery inside of your caravan, 4-wheel drive or boat to keep your battery intact.
- Great for powering your Star link connections, 240V inverters, your fridges, induction cookers, air compressions, computers, cameras, lights and much more.
- Custom Lithium stand by their products because they know that they are of high quality. That's why each purchase of one of their batteries comes with a 7 year warranty! Every single battery is individually bench-tested, so you know that you're getting a quality product.
- Your battery ain't taking a battering. All components of the battery are insulated against vibration meaning those bumpy roads won't damage your battery.
- Worry less about overheating and short-circuiting. Custom Lithium Batteries are equipped with BMS protection to ensure that your battery maintains performance throughout your journey.
- You're supporting the local economy by buying local. All Custom Lithium Batteries are made here in Australia.
Custom Lithium 280Ah Ultra Slim Lithium Battery Installation:
If you are unsure about installation, please contact us on 1300 902 361 for assistance, or alternatively please reach out for us to organise an installation.
*Improper installation will void your warranty and may result in injury.

Custom Lithium 280Ah Ultra Slim Lithium Battery Tech Specs
CAPACITY:280AH
CONSTANT DISCHARGE:330 AMPs
PEAK DISCHARGE:1060A - 1600AMP Protection
RECOMMENDED CHARGE:100 AMPs
DIMENSIONS:86mm H x 373mm W x 580mm L
DIMENSIONS - (Overall):620mm L x 373mm W x 86mm H
WEIGHT (KG):26.5kg
OPERATING TEMP:0°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
Custom Lithium 280Ah Ultra Slim Lithium Battery FAQs
1. What can the Custom Lithium 280Ah Ultra Slim Lithium Battery power?
The 280Ah Ultra Slim Battery is designed for off-grid, 4WD, caravan and canopy setups. It can power equipment such as fridges, Starlink, induction cookers, air compressors, computers, lighting and compatible 240V inverters. Its 12.8V LiFePO4 system supports up to 330A constant discharge.
2. Does the 280Ah Ultra Slim Lithium Battery require assembly or special installation?
The battery itself does not require assembly, but it must be securely mounted and correctly connected to your electrical system. Its ultra-slim 86mm profile makes it suitable for compact locations such as behind seats, beneath false floors and inside canopies. Always follow the manufacturer's mounting and installation requirements.
3. What safety features are built into the 280Ah Ultra Slim Lithium Battery?
The battery uses premium A-grade automotive LiFePO4 cells along with a high-current Heltech BMS and active balancer. The BMS provides protection against conditions such as overheating, over-discharge and short circuits, while the active balancer helps maintain consistent cell performance. Its aluminium enclosure also provides added physical protection for demanding touring and off-road applications.
4. What warranty comes with the Custom Lithium 280Ah Ultra Slim Lithium Battery?
The 280Ah Ultra Slim Lithium Battery is backed by a 7-year warranty. Each battery is individually bench-tested, and lifetime customer support is also provided. Warranty coverage is subject to the manufacturer's applicable warranty terms and conditions.