Tesla Powerwall 3
From Home batteries: capacity and warranty: What do the main home batteries actually guarantee, beyond the headline warranty length?
Capacity: 13.5 kWh
Usable or rated energy capacity as the maker states it for one unit.
energy capacity of 13.5 kWh on its initial installation date
Source: https://web.archive.org/web/20251221223944/https://energylibrary.tesla.com/docs/Public/EnergyStorage/Powerwall/General/Warranty/en-us/Powerwall-Warranty-EN.pdf. Read 2026-10-31. Checked by a second reader.
Warranty: 10 years
The warranty's stated length in years.
70% at 10 years following initial installation date
Source: https://web.archive.org/web/20251221223944/https://energylibrary.tesla.com/docs/Public/EnergyStorage/Powerwall/General/Warranty/en-us/Powerwall-Warranty-EN.pdf. Read 2026-10-31. Checked by a second reader.
Capacity guaranteed: 70% at 10 years
How much capacity the warranty promises, and when.
70% at 10 years following initial installation date
Source: https://web.archive.org/web/20251221223944/https://energylibrary.tesla.com/docs/Public/EnergyStorage/Powerwall/General/Warranty/en-us/Powerwall-Warranty-EN.pdf. Read 2026-10-31. Checked by a second reader.
Usage limit: Unlimited cycles; 37.8 MWh of aggregate throughput, any application not listed
The cycles or energy throughput that can end the warranty early.
70% at 10 years following initial installation date Unlimited cycles Any application not listed above, or any combination of applications that includes one not listed above 70% at 10 years following initial installation date 37.8 MWh of aggregate throughput
Source: https://web.archive.org/web/20251221223944/https://energylibrary.tesla.com/docs/Public/EnergyStorage/Powerwall/General/Warranty/en-us/Powerwall-Warranty-EN.pdf. Read 2026-10-31. Checked by a second reader.