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      01-05-2021, 07:13 AM   #25
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Leto1701's Avatar

Drives: BMW i8
Join Date: Nov 2019
Location: Germany

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Originally Posted by MolarBear View Post
I know for a fact the BMW dealership left the car go flat for 8 months over lockdown in a car park without plugging it in before the sale. I suspect this might have something to do with it!
The batteries don't go flat, at 0% there is a save charge level still in the battery. However, 8 months is a long time. It won't have helped the battery life. If fully charged before it might have just survived before turning into a brick. Wouldn't have bought it to be honest. 91% still sounds O.K. for the cells. The exposed "window" however should have hidden that from you. 91% visible would be O.K. for a Tesla (they allow full capacity use up to max. Voltage to advertise higher kWh and range). For BMWs more conservative strategy it is a concern.