A motorhome doesn't have "a" battery: it has two different systems with opposite requirements. This guide takes you from zero to knowing exactly what to order.

Two circuits: engine and habitation

The starter battery (Fiat Ducato, Mercedes Sprinter…) is a normal car battery — find it by number plate. The leisure battery powers fridge, lights, water pump and heating for hours without the engine: here a starter battery won't do — you need deep-cycle.

AGM, gel or lithium

AGM (~400-600 cycles) for holiday use; gel (~600-900) for frequent travel; lithium LiFePO4 (2,000-5,000 cycles, a third of the weight, 80-90% usable capacity) if the motorhome is your home.

How much capacity you need

Typical daily use is 60-80 Ah (compressor fridge 30-50, LED lights 5, pump 5, devices 10, diesel heating fan 15-20). The catch: lead batteries (AGM/gel) only comfortably deliver 50% of nominal capacity — for 70 Ah/day you need ~140 Ah nominal in lead, or ~80-90 Ah real in lithium.

Common mistakes

Fitting a starter battery in the habitation area, mixing old and new batteries in parallel, ignoring charger compatibility (lithium needs a LiFePO4-compatible charger), and choosing by price instead of cost per cycle.

Full catalogue under caravan batteries and deep-cycle batteries. Many references are supplied on demand: use the quote form on the product page and our technical team replies within 4 working hours. Start with the complete battery guide if you're new to this.