LITHIUM VS LEAD :
THE TRUTH.
Forget the sterile debates on forums. Your battery dictates 90% of your thermal and electrical comfort in a camper van.
1. The myth of AGM and Gel batteries
For years, everyone installed deep cycle batteries (Lead, AGM, or Gel). Today's reality? They are obsolete for 99% of regular nomadic uses.
- X The 50% rule: A 100Ah AGM battery actually only gives you 50Ah usable. If you drop below 50% of its capacity, you destroy its lifespan (sulfation).
- X The dead weight: Expect 30kg for a 100Ah AGM battery. In a van where every kilo costs gas, it's an aberration.
- X Anemic charging speed: Lead "refuses" to charge fast when it's almost full (endless absorption phase).
2. LiFePO4 (Lithium): The game changer
Lithium-Iron-Phosphate (LiFePO4) has swept the market. Yes, the entry ticket is higher (expect €300 to €600 for 100Ah), but the return on investment is overwhelming.
Verdict: What to choose?
If you are converting a van to live or work in (digital nomadism, 24/7 compressor fridge, stationary heating): Lithium is no longer an option, it's an absolute necessity.
AGM remains tolerable only for summer "weekend" vans, with a simple cooler and two LED lights, where the total budget is extremely restricted.
I'm Leo, an engineer and vanlifer since 2019. I've installed and tested the electrical systems in 3 different vans. Every recommendation on this site is based on hands-on experience, not copied spec sheets. I have no commercial ties with manufacturers — I only recommend what I use or would install in my own van.
Frequently Asked Questions
What battery should I choose for a camper van?+
LiFePO4 (Lithium Iron Phosphate) is the best choice for 99% of campervan uses. Unlike AGM, it offers 100% usable capacity, weighs 3x less and lasts over 3000 cycles.
How many Ah of battery do I need in a van?+
For daily use (fridge, lighting, phone charging, water pump), plan for 100 to 200Ah in lithium. For a mobile office with laptop, go for 200-300Ah.
Can I mix AGM and lithium batteries?+
No, this is strongly discouraged. The charging curves are incompatible. Lithium accepts constant high charging current, while AGM requires a slow absorption phase. Mixing risks destroying the AGM battery.