Calibrating the Battery Management System

Your Tesla's Battery Management System (BMS) calculates your range, battery level and capacity.

Over time, these calculations may become inaccurate because:

1. The calibration accuracy has drifted over time.
2. The battery has become imbalanced due to the shifting of individual battery cell voltages.

You can recalibrate the BMS accuracy and rebalance the battery cells by doing the following:

1. Let the battery fall below 10%.
2. Leave it there for at least an hour.
3. 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 an hour or longer 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 BMS is fully calibrated.