If you change the time on your iPhone 6s or iPhone 6s Plus manually or change time zones when traveling, you might notice that the battery percentage doesn't update. If this is happening with you, follow these steps:
- Restart your iPhone.
- Go to Settings > General > Date & Time and make sure that Set Automatically is turned on. Learn more about the date and time on your device here.
If this happens again and you didn't change the time or time zone on your device, contact Apple Support.