Battery capacity and maximum range decrease with usage. The Battery Health feature helps you visualize and track this effect.
You can see your battery health by going to Battery > Health in the app or Battery Health on tessie.com.
How does it work?
Batteries are difficult to measure due to their ever-changing chemical composition. Tessie takes many measurements over time — every time you charge 5 kWh or more — to accurately calculate the state of your battery.
Why is the usable capacity less than I expect?
Batteries have an unusable buffer (typically between 3-5 kWh) to protect the battery. For example, if you buy a Tesla with a 60 kWh battery, the usable capacity may be around 57 kWh.
If degradation is high, your capacity is below average or you've lost significant max range
While every battery is different — some will naturally be below average — your Tesla's battery management system (BMS) may need to be calibrated. You can teach it how much energy is in the battery by doing the following:
- Let the battery fall below 10%.
- Leave it there for at least an hour.
- Charge the battery beyond 100% — that is, charge to 100%, but keep going until the car is no longer adding any energy from the charger. This may take quite awhile after reaching 100%.
With any luck, you'll see your range and capacity increase! You can repeat this process a few times until you've maximized your range and the battery is calibrated.
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.