Calibrating the Battery Management System

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

Over time, BMS calculations may become inaccurate due to drift or imbalances caused by shifting individual cell voltages within the battery.

When to calibrate

If you experience any of the following, it's an indication that the BMS could use calibrating:

• Battery level suddenly drops or rises unexpectedly while parked
• The vehicle charges beyond the set limit
• The range displayed at 100% charge is noticeably lower than what it was previously
• Max range or health is increasing over time

How to calibrate the Battery Management System

You can recalibrate 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 to 100% and keep charging until the vehicle is no longer adding any energy from the charger. This may take an hour or longer after reaching 100%.

After this process is finished, BMS calculations will be more accurate, and as a result, battery level, range, capacity and max range will become more accurate.