How Can You Check the Battery Level on an iPhone?
The iPhone is Apple's first outing to the cell phone market, and combines the media playing capabilities of its popular iPod series with the usability of a touch screen phone. The iPhone has many features, such as the ability to browse the Internet or send text messages. Another is a maximum 12-hour battery charge. Users can easily view how much time they have left on their battery with a few taps of the screen, so long as they are using the iPhone 3GS. Unfortunately, users without the 3GS model cannot view battery percentage levels but they can still view the standard battery level bar.
View the battery icon above the status bar on the top of the screen. This gives a general level but does not tell you the charge percentage or time remaining.
Open the "Settings" application from the home screen.
Select the "General" tab and tap on "Usage."
Select "On" for "Battery Percentage." The battery icon in the status bar will then show a percentage for how much battery life is left.