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Odd. All reports of sudden drops in battery have occurred when the battery is on the lower end of a charge. Not at the upper end. Suppose it could happen if a cell went bad. Battery state of charge and subsequent estimates of range are based on voltage readings in the battery. Would have assumed that there would have been some kind of warning message though. Did you get any other message other than the sudden change in range?
 

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Yes. Read this forum, several similar reports (maybe not from 220...). Most likely one bd cell of 280, and you will get a new battery pack. When was your vehicle manufactured?
 
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