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
• Capacity, max range or battery health is increasing over time

How to calibrate the Battery Management System

There are two ways you can rebalance the battery cells and recalibrate BMS accuracy. After this process is finished, BMS calculations will be more accurate, and as a result, battery level, range, capacity and max range will be more accurate.

Simple recalibration

For a simple recalibration you can perform conveniently from anywhere, follow these steps:

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%.

Full recalibration

For a complete recalibration that guarantees the highest accuracy, follow these steps:

1. On the vehicle touchscreen, tap Controls > Service > Battery Health Test
2. The vehicle will fully drain and recharge the battery over the next 24 hours.

Note: This requires the vehicle to be plugged into an AC charger.