The iPhone, a cellphone made by Apple, has a built-in rechargeable lithium battery that you'll need to charge periodically. You can charge your iPhone whenever you want, without having to wait until it is completely drained. You can adjust a variety of settings to extend the iPhone's battery life.
About the iPhone
Apple's iPhone has a multi-touch display and two built-in cameras for shooting pictures and videos. The device connects to the Internet over cellular data networks as well as Wi-Fi. When fully charged, the iPhone provides up to seven hours of talk time and up to 300 hours of standby time. A full battery provides up to 40 hours of audio playback, up to 10 hours of video playback and up to 10 hours of Internet browsing.
Press the "Home" button below the touch-sensitive display on your iPhone and then tap "Settings" icon on the home screen. Tap "General" and then tap "Usage" to see information about the battery performance. Look at the number next to "Usage" to see how much time your iPhone has been in use since you last charged it. Look at the number next to "Standby" to see how long your iPhone has been on since the last charge, including the period when the device was asleep and not being used.
The iPhone uses more power when certain features and settings are enabled, so you can save power by adjusting settings options. Disable Wi-Fi when you aren't using it to access the Internet, as the iPhone uses power to continue checking for Wi-Fi hotspots. Turn off push notifications that tell you about new data, such as incoming text messages, if you don't need this information constantly updated. Likewise, adjust the rate at which the Mail app checks for new messages. Refrain from using location services, such as keeping your position updated for apps such as Maps, except when you actually need to use the services. Dim the screen when you don't need the display to be set to 100 percent brightness to further save power.
Charging the iPhone
According to Apple, you should let your iPhone's power drain completely at least once a month and then fully recharge it to maintain the lithium-ion battery. If your iPhone is close to being drained when you want to charge it, you could perform a task such as play a game or watch a video and leave it running until the power runs out. Connect your iPhone to a USB port on your computer with the iPhone's included USB cable to charge it. An icon of a lightning bolt appears in the upper right corner of the display while the iPhone is charging. The icon turns into an image of an electrical plug when the device is fully charged.
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