Go bigger.
Start with Custom Lithium.
From 400Ah to 1250Ah: find the capacity that powers your whole setup.
Outgrown your battery, adding big appliances or heading off-grid for longer? Tell us what you’re powering and we’ll size it properly.
Four questions. From Ultra Slim to our 1250Ah Ultra Slim XL.
When bigger makes sense
You’re adding big loads
Induction cooking, coffee machines and air-con can use more power in an hour than a fridge does all day.
You stay out longer
The longer you go without driving or sun, the more stored power you need.
You want one clean install
One high-capacity battery is simpler than several small ones. Our Ultra Slim XL goes up to 1250Ah.
A night for every 100Ah.
On a typical touring day of about 100Ah, a 1250Ah Ultra Slim XL lasts around 12 nights without charging.
Size your setup
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.
Big battery questions
What’s the biggest battery you make?
Our Ultra Slim XL goes up to 1250Ah in a single battery. For bigger systems, we design custom setups, including 24V and 48V.
Is one big battery better than two small ones?
Usually it’s simpler: one install, one set of connections and one battery to monitor. Our team can advise for your build.
How long does a big battery take to charge?
It depends on your chargers. Larger batteries suit larger DC-DC chargers and more solar. We’ll recommend a charging setup with your battery.
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.