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Custom Lithium
Next Generation 230Ah Ultra Slim Lithium Battery
CL-US-230AH-V3
A 71mm-slim LiFePO4 auxiliary battery for behind-seat, drawer and canopy installations — 230Ah usable, 330A continuous, made in Brisbane. Not a starter battery; needs a lithium-compatible DC-DC charger.
$2,280.00
When installing along the base of a canopy or vehicle floor, position the battery without the bottom mounting rail — this places the battery's weight directly onto the vehicle floor for best support. Professional auto-electrician installation is recommended.
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71MM SLIM FIT
Fits where a standard battery won't — the 71mm body slides behind seats, into drawers and inside canopy walls
330A CONTINUOUS DISCHARGE
Runs 3000W inverters and induction cooktops without the BMS shutting down. 1060A peak
240A PEAK CHARGE
Fast recharge from a lithium-profile DC-DC. 100A day-to-day, 240A when the current's there
MADE IN BRISBANE, QLD
Designed and assembled in Brisbane by Custom Lithium. Backed direct by the manufacturer for 7 years
ACTIVE-BALANCING BMS
Heltech BMS balances cells continuously — not just at top-of-charge. Cell-level voltage, current, temperature and short-circuit protection
An ultra-slim LiFePO4 auxiliary battery built to fit where a standard-format lithium or AGM won't — behind seats, inside drawer systems, under canopy floors and in camper compartments with as little as 76mm of clearance. 230Ah of usable capacity in a 71mm-slim core body, so you keep the runtime of a full-size lithium in the footprint of a slim.
Custom Lithium designs and builds it in Brisbane, and backs it with a 7-year warranty. A-grade automotive-spec LiFePO4 prismatic cells, IEC 62619 certified, protected by a Heltech BMS with an active cell balancer that works while the pack is charging, discharging or resting.
What sets it apart
- 71mm ultra-slim profile — 610 × 405 × 71mm core body (645 × 475 × 76mm overall with side rails). Fits mounting spaces a standard slim lithium won't clear.
- 330A continuous, 1060A peak discharge — runs 3000W inverters, induction cooktops and high-current 12V accessories without hitting the BMS ceiling. 1600A short-circuit protection.
- 100A recommended charge, 240A peak — fast recharge from a lithium-profile DC-DC or a high-output solar controller.
- M10 stainless terminals with side rails, bolts and covers included — ready to mount and terminate out of the carton.
- Heltech BMS with active balancer — cell-level over/under voltage, over-current, over-temperature and short-circuit protection. Balancer runs continuously, not just at top-of-charge.
⚠ Do not: connect this battery directly to a variable-voltage alternator — it will damage the alternator, the battery or both. Alternator charging must go through a lithium-compatible DC-DC charger. Solar can feed the DC-DC's solar input or run through a separate MPPT.
These are the DC-DC chargers we pair with it — sold separately.
- 230Ah capacity — in a 71mm-slim body
- 330A continuous — 1060A peak discharge, 1600A short-circuit protection
- A-grade LiFePO4 — IEC 62619 certified prismatic cells
- Heltech BMS — with active cell balancer
- 240A peak charge — 100A recommended, suits any lithium-profile DC-DC
- M10 terminals — rails, bolts and covers included
- 0°C to 60°C — BMS blocks charging below 0°C
- Made in Brisbane — 7-year Custom Lithium warranty
Capacity & discharge
Capacity: 230Ah
Constant discharge: 330A
Peak discharge: 1060A
BMS short-circuit: 1600A
Nominal voltage: 12.8V
Charging
Recommended charge: 100A
Peak charge: 240A
Charge voltage: 14.2 – 14.6V
Float voltage: 13.4 – 13.6V
Cut-off voltage: 10.5V
Cells & BMS
Chemistry: LiFePO4 A-grade
BMS: Heltech
Balancer: Active
Cell certification: IEC 62619
Operating temp: 0°C to 60°C
Terminals: M10
Everything this install needs
4 of 6 in the boxComparing against
The two ultra-slim batteries in our range a customer most often weighs it against.
