Table of Contents
Short answer
According to the federal government’s energy.gov.au, lithium-ion home batteries last 10 to 15 years on average. How long a solar battery lasts depends on how much it’s used and how well it’s maintained. A battery charged and discharged every day will need replacing sooner than one used only occasionally.
When comparing batteries, look at:
- The warranty’s terms. Battery lifetime can be measured in years, charge cycles, energy throughput, or a combination. Check the warranty conditions.
- Usable capacity. A battery can’t be fully discharged, so its usable capacity is a little less than its total capacity. For lithium-ion batteries, the difference is around 5 to 10%.
A warranty tells you what the manufacturer covers, not exactly how long the battery will run. See Are solar batteries covered by warranty?
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