Jeep Gladiator Dual Battery Fitted at Warana
We supply the Custom Lithium dual battery kit for the Jeep Gladiator and fit it at our Warana workshop. Unlike most ute kits, this one goes under the rear seat, not behind it, which keeps the cab and the tub free.
What the Gladiator kit is
The kit is a Slim lithium battery, in 100Ah or 200Ah, with a mounting tray made to sit under the rear seat. These are Custom Lithium Slim batteries, not the Ultra Slim used in the behind-seat ute kits.
To fit the tray, the factory gun casing under the rear seat has to come out. That storage is gone once the battery is in, so plan for that before you buy. The tray is also sold on its own as the Gladiator battery tray ($299.00) if you already have a battery. The kit does not include a wiring kit. See the Gladiator kit.
Custom Lithium recommends a qualified auto electrician fits it, and notes that some vehicles need small changes depending on the variant. We check the kit suits your Gladiator before you order.
What fitting at Warana includes
Our auto electrician at Warana does the full install:
- Rear seat up and the factory gun casing removed
- Tray mounted under the seat and the battery secured on it
- Cable run from the starter battery to the DC-DC charger, sized for the run, with fuses at each battery end
- Charger mounted, and a monitor or shunt connected if you have one
- Seat back down, then the charge rate and voltage checked at the second battery with the engine running
The kit does not come with a DC-DC charger unless you add one. We can supply a Redarc or Victron charger to suit, or fit yours. Our auto electrical page covers the lights, fridge and accessory wiring we also do.
What it costs
The kit price comes live from our store. Fitting depends on the vehicle and the parts you add.
Jeep Gladiator kit
Under the rear seat. 100Ah or 200Ah Slim, tray included.
- Kit from $1,389.00
- Fitment from $1,150*
*Depends on the make and model of your vehicle. Contact us for an accurate quote and to discuss your needs.
Jeep Gladiator dual battery FAQs
Where does the battery go in a Gladiator?
Do I lose the under-seat storage?
Should I get 100Ah or 200Ah?
Book your fitting
Buy the kit through us, book the fitting and drop the Gladiator off at Warana. Call or send the details through and we will book you in.

