Isuzu MU-X Dual Battery Custom Lithium 100ah
This is an estimate only. Actual delivery times can vary with stock availability, courier delays, weather, public holidays and your location.
Isuzu MU-X Dual Battery: 100Ah Hidden Under The Floor
The MU-X is a seven-seat wagon, which means every litre of space in the back is already spoken for by kids, dogs or luggage. Putting a second battery in the cargo area solves one problem and creates another. The Custom Lithium 100Ah MU-X battery goes under the wet-area rear floor instead, in a case moulded to that cavity — so the boot floor goes back down over the top of it and you'd never know it was there. Australian-made, 180 amps constant discharge, SB120 Anderson already fitted. And if 100Ah isn't enough, fit a second one alongside it for 200Ah, still entirely under the floor.
Add one to your cart and keep your boot.
Free shipping Australia-wide. Suits Isuzu MU-X 2022+.
Why The Isuzu MU-X Dual Battery May Be Right For You
- Your cargo space stays cargo space — it mounts beneath the rear floor rather than in it, so the boot still swallows the pram, the Esky and the camp chairs without working around a battery box.
- You can double it later without starting again — install a second identical unit under the same floor for a total of 200Ah, so you can start sensibly and expand when your setup grows.
- It'll run a fridge and then some — 180 amps constant discharge with 750 amps peak handles a 12V fridge, lights, a water pump and an inverter without them competing.
- Charging keeps up with the driving — 50 amps constant charge and up to 100 amps max, so a decent DC-DC charger puts real capacity back in between camps rather than trickling.
- It's made here and supported here — Australian-Made certified, which matters on something you'll own for years and might need advice or parts for.
Isuzu MU-X Dual Battery Specifications
| Capacity | 100Ah LiFePO4 |
| Fitment | Isuzu MU-X 2022+ |
| Mounting Position | Under the wet-area rear floor |
| Expandable | Fit two units for 200Ah total under the floor |
| Constant Discharge | 180 A |
| Peak Discharge | 750 A |
| Constant Charge | 50 A |
| Max Charge | 100 A |
| Cut-Off Voltage | 10.5 V |
| Connection | SB120 Anderson on battery |
| Weight | 15 kg |
| Origin | Australian-Made certified |
Isuzu MU-X Dual Battery FAQs
Can I install this myself?
Custom Lithium recommend installation by a qualified auto electrician, and so do we. These are vehicle-specific kits rather than a battery in a box — there's high-current wiring, fusing and a DC-DC charger to get right, and getting it wrong is an insurance problem rather than an inconvenience. Depending on the vehicle there may also be minor trimming or drilling involved.
Is the wiring kit included?
No. The battery is the all-in-one unit here — the wiring kit, DC-DC charger, monitor and mounting brackets are separate. Not everything shown in the photos is supplied. Give us a ring on 1300 902 361 and we'll work out exactly what you need for your setup rather than guessing.
Do I need a battery tray?
No. That's the point of a vehicle-specific battery — the case itself is shaped to the space it mounts in, so there's no separate tray, no fabrication and no hunting for a flat spot. It's why these fit where a standard rectangular battery won't.
Where are they made?
Australia. Custom Lithium's auxiliary battery systems are Australian-Made certified, so parts, support and warranty all sit here rather than at the end of a long email chain overseas.