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Battery warranty coverage
All batteries and storage systems come with a baseline level of warranty protection that ensures your battery will perform as promised for a set amount of time.
When reviewing warranty documents, there are four key line items to pay attention to:
- Warranty years: how long does the manufacturer guarantee the battery’s performance for? (e.g. 10 years)
- Cycle life warranty: does the manufacturer guarantee a set amount of cycles as part of their warranty? (e.g. 10,000 cycles–draining then recharging–during the warranty term)
- Throughput warranty: does the manufacturer ensure that your battery will deliver a certain amount of energy during its lifetime? (e.g. 20 megawatt-hours of energy)
- End of warranty capacity rating: does the manufacturer promise that the battery will hold a minimum capacity by the end of the warranty term? (e.g. 60% of its original capacity)
Importantly, battery manufacturers often don’t provide all of the warranties listed above (cycle warranties and throughput warranties are interchangeable), but it’s common to include some combination of them in their offering.
Read more about what is and isn’t covered in battery warranties
Battery system warranties at a glance
| CATEGORY | INDUSTRY STANDARD |
| Product and performance | 10 years, plus a cycles or throughput clause |
| End of warranty capacity | 60% |
| Labor for repairs/ replacements | No |
| Shipping of parts | No |
| Limitations and exceptions | Variable |
| Warranty fulfillment & manufacturer reputation | Variable |
Don't forget about battery inverters!
When comparing one battery system next to another, check to see if your storage inverter is covered! Sometimes, the two components can be sold separately and covered under separate warranties. Inverters are key to the functionality of a battery, so whether the inverter comes from the same company or a separate one, it’s important to make sure you have protection there.