Campervan Lithium Battery vs AGM: Which Should You Choose?

Your campervan leisure battery is one of the most important decisions in an off-grid conversion. The choice between lithium and AGM affects cost, weight, capacity, charging behaviour and how long the system lasts.

AGM batteries: the traditional choice

AGM (Absorbent Glass Mat) batteries are sealed lead-acid batteries that do not require maintenance. They are cheaper than lithium to buy upfront, widely available and suitable for moderate off-grid use. The main limitations are lower usable capacity (typically 50% of rated capacity before damage), heavier weight and shorter cycle life compared to lithium.

Lithium batteries: the modern choice

Lithium iron phosphate (LiFePO4) batteries offer usable capacity of up to 80–90% of their rated capacity, much lower weight, faster charging and a significantly longer cycle life — often 2,000–5,000 cycles versus 300–500 for AGM. The upfront cost is higher but the total cost of ownership over time is often lower.

Which is right for your campervan?

For occasional weekend touring with access to hook-up, AGM can be adequate and saves money upfront. For regular off-grid touring, wild camping, or full-time use, lithium is almost always the better choice once total cost and usable capacity are compared properly. All Bossway campervans can be specified with lithium battery systems.

What else affects your electrical system?

Solar panel output, solar controller type (MPPT is more efficient than PWM), inverter size, charging from the alternator and shore power charger specification all affect how well your system works in practice. Speak to Bossway when configuring your electrical spec — these decisions affect touring experience significantly.