Questions answered: Home batteries & backup

How many years does a home battery last?

Q: How many years does a home battery last?

Makers warrant them for about 15 years or a set amount of use, whichever comes first. Enphase warrants its IQ Battery 10C for up to 15 years or 6,000 cycles, holding 60% of its capacity, and FranklinWH warrants the aPower 2 for 15 years or 60 MWh of throughput. The 60% figure in Enphase's warranty tells you capacity is expected to fade with use.

Updated October 25, 2026. Every answer lists the sources we read it from. If we couldn't back an answer, we left the question out.

Home wiring is a job for a licensed electrician. New circuits, outlets, transfer switches and battery connections must meet the National Electrical Code and your local rules, and many need a permit and inspection.

For scale: 6,000 full cycles is one a day for about 16 years, and 60 MWh is 4,000 full charges of a 15 kWh battery.

Read the warranty for the exact terms: what counts as a cycle, the capacity it guarantees and whether it transfers if you sell the house.

Sources

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Home battery backupWhole-home and plug-in systems, priced.

Estimates only. Your actual costs depend on your utility's rate plan, how and when you charge or use power, and local prices. This is general information, not financial, tax or legal advice. See our disclaimer.

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