12 February

The Powerwall 2 ships with a capacity of 13.5 kWh. But because it’s chemistry and not neat, you’ll often get more than that. You can test how much the capacity of your battery has degraded over time, it’s warranted to still have 70% of capacity after 10 years. We’ve been using ours for over a year now. I tested the capacity today, it was 14.7 kWh. Not even more than advertised, we’ve also had 0% degradation in a year of heavy use. These things are beautifully engineered.