Last updated 13-Feb-2026
We have captured the battery capacity thousands of times, at different mileages, and different years of production, for many different models of Tesla.
Tesla have used different battery sizes in the same model at the same time depending where in the world the car is being delivered, and there is no obvious way via the API to determine the battery installed in a specific car. As a result, you may see 2 distinct areas of data points which correspond to the different batteries, although this is usually also highlighted by the model year, each of which is coloured differently.
It is also worth noting that on older cars, Tesla may have replaced the battery with a larger capacity battery which can result in some abnormal datapoints. The charts also plot the battery capacity against miles travelled, a replacement battery will therefore appear to have its degradation started by an offset mileage. In other words, if a car has a new battery at 70k miles, the degradation after 10k miles (80k indicated miles) will be similar to another car after 10k miles from new.
The final word of caution is the accuracy of the measurements is linked to the calibration of the BMS and whether the cells require cell balancing. Addressing both of these things, which is relatively easy as an owner, can improve the results.
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