How long does a home battery last?
Updated August 2026
A home battery lasts 10–15 years. Most units carry a warranty of about 10 years or a fixed lifetime energy throughput, usually quoted in MWh cycled, whichever limit you hit first. Expect the cells to still hold roughly 60–70% of their original usable capacity when that warranty ends, then keep fading a little each year. Two things decide whether yours reaches 10 or 15: how many full cycles you run through it and how hot it gets.
Lifespan by type and situation
| Type or situation | Typical lifespan | Why |
|---|---|---|
| Lithium-ion (LFP) unit | 12–15 years | The common home chemistry now; tolerates heat and daily cycling better |
| Lithium-ion (NMC) unit | 10–13 years | Higher energy density, a bit more sensitive to heat and deep cycling |
| Warranty period | ~10 years | Or a stated energy throughput in MWh, whichever comes first |
| Daily deep cycling | Toward 10 years | A full charge and discharge every day spends the cycle count fastest |
| Garage or shaded install | Toward 15 years | Staying near room temperature is the single biggest life extender |
| Hot outdoor wall, full sun | Cut 2–4 years | Sustained heat above 85°F speeds up capacity loss |
Signs yours is near the end
- The app shows usable capacity has slid well below its original rating, often past a 30% fade
- Backup runtime during an outage is noticeably shorter than it was when the battery was new
- It no longer holds a full charge overnight even with solar topping it off during the day
- Repeated fault or over-temperature warnings from the inverter or battery management system
- The warranty has lapsed and reported capacity is near or below its guaranteed floor
How to add years
Heat is the enemy, so siting matters most: a battery mounted in a garage or shaded spot that stays near 70°F will outlast the same unit baking on a sunny south wall by years. Leaving a little reserve in the settings helps too, since a floor that never runs the pack all the way to empty eases the wear that daily deep cycles cause. Keep the firmware current and walk the home battery maintenance checklist once a season to catch cooling-fan or loose-connection problems early. If you are unsure what a home battery is really doing as its warranty runs out, the repair-or-replace guide walks through whether a single-module swap or a full replacement pays off.
What it costs to replace: plan on $10,000–20,000 installed for a whole unit. Replacing on your own schedule, before it fails, is almost always cheaper than the emergency version. The home maintenance cost calculator helps you set the money aside before it comes due.
OnOtto tracks your battery health checks age and service history, and warns you before end of life instead of after the flood.
Track your home's systems, free for 30 daysFrequently asked questions
How many cycles does a home battery last?
Home lithium batteries are typically rated for several thousand full charge-and-discharge cycles, commonly 3,000 to 6,000, and many warranties are written around that count rather than pure calendar years. If you cycle the pack once a day, 6,000 cycles is roughly 16 years, but daily deep cycling and heat usually push you to the capacity floor closer to 10 to 12 years. Lighter use, cycling only during outages or peak-rate windows, stretches the same battery well past 15.
What happens to a home battery at the end of its warranty?
It does not shut off; it just holds less. A 10-year warranty typically guarantees the battery will still deliver around 60 to 70% of its original usable capacity at year 10, so a 13.5 kWh pack might give you closer to 9 kWh of backup. Past that point capacity keeps sliding a percent or two a year. You can keep running it until the shorter runtime stops being useful, then replace the whole unit or, on some systems, a single module.
Does a home battery last as long as solar panels?
No, and that mismatch matters when you budget. Solar panels commonly run 25 to 30 years, while a home battery lasts 10 to 15, so plan to replace the battery once or even twice over the life of the array. Size the wiring and set aside money for that swap up front. The panels and inverter usually keep producing while you change out an aged battery, so the storage upgrade rarely disrupts the rest of the system.