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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.

Deep DischargeYou can empty a lithium battery to 90% or even 100% (thanks to its built-in BMS) without damaging it. 100Ah of Lithium = 100Ah real usable.
Brutal RechargeLithium accepts immense charging currents. If you have a big alternator booster, you drive for 2 hours and your bank is full.
Featherweight~11kg for 100Ah. It's night and day for outfitting your cargo area.
LifespanOver 3000 cycles compared to 500 for an AGM. It will probably outlive your van.

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.

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