Home battery warranty, explained.
Last updated 2 October 2026
Battery warranties aren't all written the same way. Here's what the common terms actually mean.
Years
The length of time the warranty covers, regardless of how much the battery has actually been used.
Cycles
A cap on how many full charge and discharge cycles are covered. Some warranties state this directly, others state an equivalent throughput figure instead.
Throughput
The total energy (in MWh) the battery is guaranteed to deliver over its life, an alternative way of capping warranty cover without stating a specific cycle count.
Retained capacity
The minimum percentage of original capacity guaranteed at the end of the warranty period, for example 70%. The battery doesn't stop working once it reaches that point, it just isn't guaranteed to hold more than that.
Published warranty by model
As stated in each manufacturer's own published specs. Not every manufacturer publishes a warranty figure for every model, shown as not published rather than guessed.
| Brand | Model | Warranty |
|---|---|---|
| Sigenergy | SigenStor | 10 years to 70% retention or a set energy throughput (15.84 MWh per 5.2 kWh module, 23.77 MWh per 7.8 kWh module), whichever comes first. Excludes installs within 500m of the coastline. |
| Sungrow | SBR HV (SBR096-SBR256) | Not published |
| Tesla | Powerwall 3 | 10 years, parts and labour, 70% retention; unlimited cycling for standard home use. |
| AlphaESS | SMILE-G3 | 5-year product warranty, 10-year battery performance warranty backed by Munich Re. |
| GoodWe | Lynx Home F Plus+ | Not published |
| FoxESS | EQ4800 | 10 years to 70% retention, or 4.2 MWh/kWh throughput minimum, whichever comes first. |
| Enphase | IQ Battery 5P | 15 years, up to 6,000 cycles : the longest standard residential warranty in the AU market, per Enphase. |
| BYD | Battery-Box Premium HVS | 10 years; spare parts available for at least 10 years after production ends. |
| BYD | Battery-Box Premium HVM | 10 years. |
| BYD | Battery-Box Premium LVS | 10 years. |
See how cycles and degradation actually affect lifespan in how long do solar batteries last?.
Compare battery brands
See every battery brand and model →Common questions
Does the battery warranty cover installation?+
That's between you and your installer, not the battery manufacturer. The manufacturer's warranty covers the battery itself; installation workmanship is typically covered separately by the installer.
What happens if a warranty term isn't published?+
Some manufacturers haven't published a specific figure for every model. Ask your installer to confirm the current warranty directly with the manufacturer before you buy, rather than assuming a figure that isn't stated.