iPhone 6 iOS 9.3.1 Battery percentage showing incorrect
I have an iPhone 6 with iOS 9.3.1. Over the last couple of weeks I have noticed the battery percentage does not display correctly. It will show 100% for hours after unplugging from the charger. It will die when the battery percentage shows 25% to 28%. How can this be fixed? I have always had Date & Time set automatically and i do not travel between time zones. I appreciate the help.
iPhone 6, iOS 9.3.1