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      01-05-2021, 03:15 AM   #23
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Drives: BMW i8
Join Date: Nov 2019
Location: Germany

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Originally Posted by MolarBear View Post
My local dealership (Leeds, UK) tested the batteries for me. It involved discharging and recharging the batteries - they printed an extensive report with a load of figures with voltages of each of the cells and different figures. All within range although annoyingly despite the low age and mileage (20 months or so, and 7000 miles) it was at 91%.
LiIon batteries don't age in a linear way. They loose some capacity quickly in the beginning and then the curve goes pretty flat. So I wouldn't worry about 91%. That might now hardly change for a couple years. This is how both my Tesla batteries behaved (before Tesla started to limit charging speed and power output for aging batteries to circumvent their own warranty).