The problem is only really likely to affect you if you’re the sort of globe-trotting iPhone owner that s forever passing through time zones, or are someone that has a strange penchant for manually setting the time and date on your phone.
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Either way, if you notice that your battery percentage no longer updates, the time setting is likely the culprit.
Apple will likely roll out a fix with the next iterative update for iOS, but it says that, for now, if you’re suffering from this problem you should restart your phone and ensure that your Date & Time settings are switched to ‘Set Automatically.’
The company is advising anyone who continues to have the same problem – or who hasn’t been playing around with the time and date, but is getting the error anyway – to get in touch with Apple Support.
➤ If your iPhone 6s or iPhone 6s Plus battery percentage doesn‘t update [Apple Support]