To get a stable reading, the battery needs to be left for several hours without being used or charging, ideally without sentry mode running. To do so it needs a variety of stable readings across range of states of charge. Calibration v cell balancingįor the BMS to accurately understand the status of the battery it needs to maintain its calibration. The petrol equivalent would be to show how many gallons of petrol are in a car using the US definition of a gallon and not the imperial gallon resulting in a different number, in practice the car holds the same amount of energy/petrol. the car assumes it can do 4 miles per kwh. Don't forget, the battery stores energy, not miles, and the mileage figure is based on a conversion factor applied by the car i.e. This is one of the most common queries from new owners where their factory fresh car does not show the range the spec sheet shows, however this entirely normal and correct. The value should however be reasonably close and generally no mode than 5-10%.įor countries where the car is rated using the WLTP standards, it is also worth noting that the car displays the range using the EPA standard which can differ more significantly. There are a couple of reasons for this, temperature will not be optimal and there will be some small loses in capacity through natural and reasonable degradation. It is, however, worth noting that the range displayed on the screen is unlikely to ever show the rated range given by Tesla when charged to 100%. It's still relatively unusual to actually have a faulty battery, and the guide we set out below will give you some techniques to restore some of the lost indicated range. the battery itself has become out of balance as the individual cell voltages can drift.the BMS has been unable to maintain its calibration and its accuracy has drifted, or.This is all controlled by the battery management system (BMS) and is typically caused by one of two issues: Owners often comment about the indicated battery range not being what it was, that charging stops short of 100% even when set to 100% or that they have heard about rebalancing the batteries. Tesla battery management system (BMS) calibration
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