iPhone 6s and 6s Plus users are complaining about their iOS battery percentage indicator not updated although the battery is actually draining out. It causes a problem for them. Apple response back and said they are working to identify the issue and fix it. Early finding found it may cause by time zone changes. But until then, users can either restart their iPhone each time they want to view their battery level or try to go to Settings > General > Date & Time and enable Set Automatically.