Custom Lithium 1250Ah NextGen 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.
1250Ah Slimline Lithium Battery, Massive Power You Can Count On!
You know the drill limited space, not enough power, and somehow your battery always gives up right when you’re getting comfortable. Whether it’s the fridge, lights, or a cheeky bit of air con, it all adds up quick.
The Custom Lithium 1250Ah NextGen Ultra Slim is built to sort that out heaps of power packed into a slim unit that actually fits where you need it. No more compromises, no more power juggling just set up and enjoy the trip like you planned.
Ready to upgrade and make life easier? Jump on it now.
Stop running out of power and add one to your cart today.

Why The Custom Lithium 1250Ah Battery May Be Right For You:
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Enjoy hassle-free installs with a slimline design, thanks to the ultra slim battery build, so it slots neatly into tight spaces without the usual mucking around.
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Get serious, reliable power for all your gear with massive capacity on tap, driven by the 1250Ah lithium setup, so you can run everything comfortably without stressing about running out.
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Spend more time enjoying your trip and less time worrying about your battery, with dependable long-lasting performance, thanks to high-quality lithium tech, so your setup just keeps ticking along.
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Keep things running smoothly even in tough Aussie conditions with solid, durable performance, backed by a rugged build and advanced battery management system, so you’re covered wherever you pull up.
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Save yourself from constant upgrades and power compromises with future-proof energy storage, delivered by the next-gen lithium technology, so you can set it up once and be good to go for years.

1250Ah Ultra Slim Lithium Battery Package Contents:
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1 x Custom Lithium 1250Ah Ultra Slim Lithium Battery
Custom Lithium 1250Ah Ultra Slim Battery Installation Guide:

Custom Lithium 1250Ah NextGen Ultra Slim Lithium Battery Tech Specs
Capacity: 1250Ah
Nominal Voltage: 12.8V
Constant Discharge: 380A
Peak Discharge: 1200A–1600A Protection
Recommended Charge: 130A
Dimensions: 803mm L x 487mm H x 163mm W
Overall Dimensions: 830mm L x 487mm W x 163mm H
Weight: 102kg
Operating Temperature: 0°C–60°C
Terminals: M10
Charge Voltage: 14.2V–14.6V
Absorption/Float Voltage: 13.4V–13.6V
Cut-Off Voltage: 10.5V
Custom Lithium 1250Ah NextGen Ultra Slim Lithium Battery FAQs
1. What can the 1250Ah Ultra Slim XL Lithium Battery be used for?
The 1250Ah battery is designed for high-demand off-grid power systems in caravans, 4WD canopies, RVs and similar setups. Its large capacity can support equipment such as 240V inverters, fridges, induction cookers, Starlink, air compressors, computers, cameras and lighting when paired with a correctly designed electrical system.
2. Does the battery require assembly or professional installation?
The battery itself does not require assembly, but it must be securely mounted and correctly connected to the vehicle or off-grid electrical system. Custom Lithium recommends hard-mounting the battery to the floor when installed along the base of a canopy or similar surface and recommends installation by a qualified auto electrician.
3. What safety features are built into the battery?
The battery uses premium A-grade automotive LiFePO4 cells and incorporates a Heltech BMS with an active balancer. The BMS provides protection against conditions such as overheating, over-discharge and low temperatures, while the active balancer helps maintain the individual cells for reliable performance.
4. What warranty does the 1250Ah battery come with?
Custom Lithium states that the Next Generation Ultra Slim XL 1250Ah Lithium Battery is backed by a 7-year warranty. The product is also individually bench-tested and comes with lifetime customer support. For specific warranty conditions, exclusions and claim requirements, customers should refer to Custom Lithium's current warranty terms.