Cycle life, temperature and the habits that decide whether a pack runs 2,000 or 6,000 cycles.
Cycle life and what ends it early
Heat and sitting at 100% are the two killers. Depth of discharge matters less than the industry believes for LFP.
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Temperature, cold and self-heating
LFP tolerates heat better than NMC and simply loses capacity in the cold. Charging below freezing is the one hard rule.
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Charging habits and BMS behaviour
A BMS that balances well and a charger that respects the profile are worth more than an extra 10% of capacity.
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Lifespan & performance questions
The questions that come before an order.
What shortens a LiFePO4 battery’s life?
Heat, sitting at 100% state of charge for weeks, and charging below freezing. Depth of discharge matters far less than those three.
Can LiFePO4 be charged in freezing weather?
Not without a heater or a self-heating pack. Discharging in the cold is fine; charging below 0°C plates lithium and permanently damages the cell.
Does LiFePO4 lose capacity over time?
Slowly, and mostly in the first year. Expect a few percent of calendar ageing annually at normal temperatures, then a long plateau.
How do I know my battery is still healthy?
Watch the BMS: cell balance under load, internal resistance trend and the capacity it actually delivers. A pack that suddenly needs long balancing is on its way out.
Is 80% depth of discharge better than 100%?
Marginally for LFP. If the extra capacity is genuinely useful, use it — the cycle difference is far smaller than for NMC.
