There have been Bluetooth battery level indicators since at least iOS 7, for Bluetooth devices which support the feature. Admittedly, those were harder to read

There have been Bluetooth battery level indicators since at least iOS 7, for Bluetooth devices which support the feature. Admittedly, those were harder to read and did not show a percentage. Here's a screenshot: http://community.silabs.com/t5/image/serverpage/image-id/3915i627E9B4ADE9B59EF http://community.silabs.com/t5/image/serverpage/image-id/391...