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Battery range increasing AFTER charging completes?

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I get this too. The explanation on range going up is IMO due to battery temperature changes and BMS adjustments. After all, it's just a guess. It is just not possible to know exactly how much energy is in the battery and how much is 100%, so the BMS constantly adjusts its guess. The way you drive and charge the car affects the BMS too. See the sticky on how someone regained half his lost range for some insights. I've done it and it changed my total range too...