Usually, you can find a simple explanation for an iPhone's failure to charge. Sometimes the cords aren't properly plugged in, sometimes you have to reset the outlet, and sometimes your computer goes to sleep. To fix this issue, you must first rule out any external problems; then you can worry about the phone's internal battery.
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About the iPhone Battery
The iPhone uses a built-in rechargeable lithium-ion battery. On average, it can last for up to seven hours for use as a phone, six hours for Internet use on the 3G network, 10 hours for Internet use on Wi-Fi, 10 hours for video playback, 40 hours for audio playback and 300 hours on standby.
You can charge the battery via a USB cable connected to either your computer or a power adaptor that plugs into a wall outlet.
Plugs and Ports
The equipment you use to charge your iPhone may malfunction. Try using a different USB cable. If you use a power adaptor, try using your computer -- or vice versa. Make sure the ends of your USB cable are clean and that the ports where you plug it in are free of dust and grime. Insert your plugs properly: the trident symbol on the USB plug should face upward when you plug it into the USB port, and the rectangle with the line on the Universal Dock plug should face forward (toward the front screen) when you plug it into the phone's port.
If your power source is not providing power, your iPhone cannot charge. Try plugging your power adaptor into a different wall outlet, preferably in another room, or reset the current outlet. If you are using a computer, make sure that your computer has not gone to Sleep Mode and that the computer itself is fully charged and plugged into a power source. Your iPhone will not begin to charge until your computer is not on standby.
Temperature and Software
Your iPhone's battery cannot operate in extreme temperatures. For peak performance, your iPhone should be kept at room temperature, around 21.1 degrees Celsius. In addition, failure to update your iTunes and iPhone software can result in a failure to charge. Open iTunes, click "File," and select "Check for Updates." Then plug in your phone, click its name under "Devices" on the left, and click "Check for Updates" in the centre screen. If you need updates, follow the prompts to download and install them.
Keep in mind that if your iPhone is completely out of power, it will take about five minutes for it to acquire enough charge to turn back on. Before you assume it isn't charging, leave it plugged in and wait for a while.
If all of this fails, your iPhone will need a new battery. Take it to a local Apple Store.
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