Power that fits.
Start with Custom Lithium.
Tell us where it needs to go. We’ll find the battery that fits it.
Behind the seat, under a floor or inside a canopy wall: our Ultra Slim range was designed for the spaces other batteries can’t reach.
Four questions. Have a tape measure handy.
Space is the real limit
Measure first
Measure the depth, width and height of the space, and leave room for cables and terminals.
Two ways to fit
V2 has our smallest footprint for custom installs. Next Gen adds modular mounting for a faster, cleaner fit.
No compromise on power
Slim doesn’t mean small. Our Ultra Slim range runs from 50Ah to 620Ah.
Turn it side-on.
Our slimmest Ultra Slim is 55mm thick, so it fits behind a seat, under a floor or inside a canopy wall.
Find your fit
Your match
A starting point based on typical power draws, not a quote. Real use depends on your appliances, climate and charging. Our team will confirm before you buy.
Fit questions
What’s the difference between V2 and Next Gen?
Only the case. Next Gen has a modular mounting system built in; V2 doesn’t, so it’s smaller. Same cells, same protection, same 7-year warranty.
Can it go on its side or upright?
Mounting orientation depends on the model. Download the mounting orientation instructions from the product page, or call us.
Can you check my measurements?
Yes. Call or email us with your space’s depth, width and height, and we’ll confirm what fits.
Talk to the people who build it.
Installation. Adding a dual battery or auxiliary power system is a modification to your vehicle, and most installs involve some changes to wiring, trim or mounting. We recommend having a qualified auto electrician install your system.