How long do lithium LiFePO4 batteries last?

A lithium iron phosphate (LiFePO4) battery lasts 2,000 full cycles at 100% depth of discharge — roughly 5–11 years depending on how often you cycle it — or up to 8,000 cycles when discharged to only 50% each time.

LiFePO4 chemistry outlasts lead-acid and AGM alternatives by a wide margin because the iron phosphate bond stays stable through deep, repeated cycling without the sulfation and plate degradation that kills lead-acid cells early. Standard flooded lead-acid batteries deliver 200–300 cycles; AGM tops out around 400–600. At one full charge cycle per day, a LiFePO4 battery hits 2,000 cycles in roughly 5.5 years; at one cycle every two days — common for weekend campers or solar backup users — that same rating stretches to about 11 years. These numbers assume a LiFePO4-compatible charger and ambient temperatures above 32°F during every charge session.

• LiFePO4 cycle life: 2,000 cycles at 100% DOD / up to 8,000 cycles at 50% DOD.
• Daily cycling rate: 2,000 cycles equals approximately 5.5 years at one full cycle per day.
• Every-other-day cycling rate: 2,000 cycles equals approximately 11 years for weekend or backup use.
• Lead-acid comparison: flooded lead-acid lasts 200–300 cycles; AGM lasts 400–600 cycles at equivalent DOD.
• Cycle life assumes charging above 32°F with a LiFePO4-profile charger — cold charging permanently reduces cell capacity.