Weight, lifespan, usable capacity and price – here are the real differences between LiFePO4 and AGM, so you can choose the right battery.

If you are looking to replace the battery in your motorhome, boat, or solar power system, the choice is typically between a LiFePO4 lithium battery and an AGM lead-acid battery. Here are the key differences.

Usable capacity

An AGM battery should not be discharged by more than approx. 50% if you want it to last. A LiFePO4 battery can use 80–100% of its capacity. A 100Ah lithium battery therefore gives you roughly twice as much usable power as a 100Ah AGM battery.

Weight

Lithium typically weighs one-third of a lead-acid battery with the same capacity. In a motorhome or boat, this means more room for cargo – and lower fuel consumption.

Service life

AGM batteries typically handle a few hundred charge and discharge cycles. LiFePO4 handles several thousand. Over the battery's service life, lithium is therefore often cheaper per kWh, even though the purchase price is higher.

Voltage and charging

Lithium maintains a stable voltage almost all the way down, so equipment runs just as well whether the battery is full or half-empty. Lithium can also accept a high charging current, so it charges faster from an alternator and solar panels. Remember to use a charger and a DC/DC charger with a LiFePO4 profile.

When does AGM make sense?

• When the budget is tight and the battery is only used occasionally.
• As a starter battery.
• At very low temperatures, where lithium cannot be charged without a heating element.

Conclusion

If you use the battery regularly, LiFePO4 is almost always the best investment. If it is just for standby use, AGM may be sufficient.

See our lithium batteries and Victron AGM batteries, or ask us for advice.

Tags

AGM Guide Lithiumbatterier

• Share on:
• WhatsApp
• Deel
• X
• Pin
• Messenger
• Email

---