Is the little battery icon in the top right corner of your iPhone not a clear enough indicator of how much juice your battery has left? If so, here’s a trick for getting easier-to-understand information.
Using iOS 4, devices can show how much battery life they have left as a percentage. To turn this setting on:
- Tap Settings
- Tap Usage
- Slide "Battery Percentage" to On.
This will add a numerical display of your iPhone battery life to the top right corner of the screen.