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How Long Do Home Batteries Last? Cycles, Degradation & Warranties

Batteries degrade over time. Here’s what cycle life, depth of discharge and temperature mean for how long yours will last.

WaterFuelAndSolarEnergy.com Editorial Team Updated December 2024 6 min read

A battery’s lifespan is measured in charge cycles and calendar years. Most residential units are warrantied for 10 years or around 6,000–10,000 cycles to 70% capacity, whichever comes first.

What wears a battery down

  • Deep discharges (using most of the capacity each day)
  • High temperatures and poor ventilation
  • Continuous fast charging
  • Years of calendar ageing even when barely used

Reading a spec sheet

Look for the warranty "throughput" figure — the total kWh a battery is guaranteed to deliver over its life. Divide by your expected daily cycling to estimate real-world life.