Battery capacity and maximum range slightly decrease with usage. The Battery Health feature helps you visualize and monitor this effect.
How does it work?
Batteries are difficult to measure due to their ever-changing chemical composition. Tessie takes thousands of measurements over time to accurately calculate battery conditions.
How can I optimize my battery health?
The single most meaningful thing you can do to optimize your battery health (and your maximum range) is to not let your Tesla remain at 100% charge.
When batteries remain at capacity, it accelerates degradation.
Maximum capacity starts to decrease immediately, and tends to stabilize around a 10% loss around 100,000 miles or 150,000 kilometers.
Tesla occasionally releases data on energy retention. See the graph below.
Why was there a sudden change in max range?
Range readings are occasionally changed via software updates. This is the most common cause.
This can also happen if a vehicle has a configuration change that affects range, like changing wheel sizes.
How is battery capacity and max range measured?
Max range is the range value displayed in your vehicle if it was charged to 100%.
Battery capacity is the "energy added" value displayed in your vehicle if you were to charge it from 0% to 100%.
Tessie continuously extrapolates these data points to monitor for changes in your battery.