How Long Should an RV Battery Last?

An AGM RV battery lasts 4–7 years, or roughly 300 to 700 cycles at 50% depth of discharge. A LiFePO4 (lithium) battery lasts 10+ years, or 3,000 to 5,000 cycles at 80% DoD depending on how deeply you discharge it.

AGM Battery Lifespan

Under normal RV use (seasonal camping, not daily cycling), an AGM battery gives 4–7 years of service. Cycle life runs 300 to 700 full cycles at 50% DoD before capacity falls to about 80% of rated.

Three things cut that short:

Overcharging. Sustained charging above 14.8V drives gassing and electrolyte loss. AGM cells are sealed, so that water never comes back.
Chronic partial charge. Leaving an AGM sitting below 12.6V lets sulfate crystals harden on the plates. This is the single most common cause of premature RV battery death.
Freezing while discharged. A fully charged lead-acid battery's electrolyte doesn't freeze until roughly -80°F. A fully discharged one freezes at about +20°F, and at 40% state of charge it freezes near -16°F. The ice expands, bends the plates, and often cracks the case.

LiFePO4 Battery Lifespan

Expect 10+ years. Cycle ratings vary by brand, and the number depends heavily on how deep you discharge:

Battle Born rates its 100Ah 12V LiFePO4 at 3,000–5,000 cycles, backed by a 10-year warranty.
LiTime publishes a depth-of-discharge ladder for its 12V 100Ah: 4,000 cycles at 100% DoD, 6,000 at 80% DoD, and 15,000 at 60% DoD, with a 5-year warranty.

Put that against real use. Cycling once per weekend is about 52 cycles a year. At 4,000 cycles, that's 76 years of cycling, far beyond any realistic ownership window. For weekend RVers, calendar aging (10–15 years) is the practical limit, not cycle count. Cycle ratings only become the binding constraint for full-timers cycling daily.

Note the trade-off buried in LiTime's ladder: discharging to 60% instead of 100% nearly quadruples cycle life. If you size your bank so you rarely go below 40% remaining, the pack outlives the RV.

What Shortens RV Battery Life

Heat. This is the most underrated killer. Every 15°F (8°C) of sustained temperature above 77°F roughly halves lead-acid service life. A battery rated for 10 years at 77°F becomes a 5-year battery at 92°F and a 30-month battery at 106°F. A battery bay on the sunny side of an RV parked in Arizona is a battery bay eating years off your investment. Heat damage is permanent. Capacity never comes back.

Sitting discharged. Both chemistries suffer, for different reasons. AGM sulfates. LiFePO4 cells can drop below the BMS cutoff (around 10V for a 12V pack) and refuse to wake up. Before storing, charge AGM to 100% and LiFePO4 to 60–80%.

Storage self-discharge. A lead-acid battery stored at 80°F self-discharges about 4% per week. Stored at 65°F, that falls to roughly 3% per month. Cool storage buys you months.

Signs Your Battery Is Near End of Life

Age alone isn't a verdict. A 6-year-old AGM that still passes a load test is a working battery, and a 2-year-old one that's been cooked in a hot bay may already be finished. Test before you replace.

For the specific voltage thresholds, load-test procedure, and LiFePO4 capacity check, see How Do I Know When My RV Battery Needs Replacing?

If you're pricing a replacement, the best LiFePO4 batteries guide covers current options.