Tesla battery health can be monitored via OBD diagnostic tools

Tesla vehicle owners can determine the precise health and actual capacity of their batteries using specific diagnostic tools, as the standard dashboard display only shows charge percentage rather than true state of health.

To perform this diagnostic, users require a proprietary adapter to convert the Tesla connector into a standard OBD2 port, alongside a high-speed Bluetooth OBD box, such as the OBDLink MX+. This hardware allows the ‘Scan My Tesla’ application to access the vehicle's CAN bus data to report real capacity and degradation levels since the car's original manufacture.

Verifying battery capacity is increasingly important for owners looking to resell vehicles or those seeking eligibility for certain electric vehicle subsidies, which often require a certified battery capacity threshold, typically above 80%. Using these diagnostic tools is a passive process that reads data without modifying vehicle parameters, meaning it does not affect the manufacturer's warranty.