If you’ve changed the time on your iPhone 6s or 6s Plus, you might have encountered an odd issue where your iPhone’s battery percentage indicator in the status bar doesn’t update like it should. Sound familiar? If so, you’ll be happy to know that Apple is on the case.
a page added to Apple’s support site last week, Apple is investigating reports that the battery status indicator on the iPhone 6s and 6s Plus stops working correctly when you manually change the time on your phone or change time zones. The problem only occurs on the iPhone 6s and 6s Plus, according to Apple, and only happens when you manually change the time or time zone setting.
Apple’s looking into a more permanent fix, but in the meantime, if you run across this issue, Apple says to you restart your iPhone, then set your phone to update its clock automatically. To do so, open the Settings app, tap General, then tap Date & Time. Next, slide the “Set Automatically” toggle to the “on” position—the slider will turn green.