Like all electronic components, iPhone batteries don't last forever. Apple will replace your battery if you send in your phone, but repairs take a few days, and the repair will cost $79 plus shipping. If you're confident with electronic repairs, you can do the same job on your own for a fraction of the cost. Be aware that opening up your iPhone will void your warranty, so you'll be stuck with any damages that your device suffers.
Remove the SIM card from the top of your iPhone. On either side of the SIM dock, you will see two small screws. Remove the screws and set them aside. You will need the screws again later, so put them in a safe place.
Use a flathead screwdriver or the edge of a hobby knife to gently pry open the iPhone case along its seam. Lift up the top panel. There will be three ribbon cables connecting the motherboard to the inside of the screen. Unclip all three cables and set the top panel aside.
Remove the motherboard (as the motherboard will be face-down inside the case, all you will see is a plain gray metal board). This will be held in place by seven small screws. Unscrew them and set them aside for later. Disconnect the ribbon cable and lift out the motherboard. Be careful when handling this piece of hardware.
Lift up the battery. The battery is held in place with adhesive which should come loose with a small amount of force. Replace the old battery with the new one. Replace the motherboard and reconnect the ribbon cable. Reconnect the three ribbon cables to the top panel. Screw the top panel back into place. Turn on your iPhone to verify that your device is working properly.
- Spare iPhone batteries can be purchased from electronics vendors online. They cannot be purchased directly from Apple.
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