How to Replace the Battery in an iPhone 3G

Written by john park
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How to Replace the Battery in an iPhone 3G
(battery image by Sergey Juchkov from

The joy and convenience of an iPhone can go only as far as its battery life will allow it. Not all batteries last as long as they should, and when the time comes and a battery dies, it is time to have it replaced. You can send your phone away to have it serviced, or you can take up the challenge of replacing your own battery. The following steps will guide you in replacing your own iPhone 3G battery.

Skill level:

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Things you need

  • iPhone 3G
  • Replacement battery
  • Miniature Philips-head screwdriver
  • Flathead screwdriver

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    Replacing the iPhone 3G Battery

  1. 1

    Remove the SIM tray located on the top of the phone. The SIM tray is located between the hold button and the headphone jack and can be removed by using a paper clip or the SIM removal tool provided with the phone to poke the small eject button. The tray should pop out, allowing for its removal.

  2. 2

    Use a miniature Phillips-head screwdriver and remove the two screws on the bottom of the phone. The screws are located on either side of the connector slot. Be sure to place them somewhere safe as they are quite small and easy to lose.

  3. 3

    Gently pry open the back from the screen with a small flathead screwdriver or a similar tool. The most effective place to pry is right where the first screw was removed.

  4. 4

    Disconnect the screen from the back by located the three connecting tabs. These tabs are labelled with the numbers 1, 2 and 3. They should be pried loose in numerical order, starting with number 1, using the flathead screwdriver or similar tool. Use the utmost caution when removing these tabs so as not to damage them in any way.

  5. 5

    Remove the cables labelled 4, 5 and 6 located on the back of the phone, once again in numerical order, and locate and remove the seven screws keeping the motherboard in place. One of the seven screws is hidden under a label towards the bottom of the phone and can be removed with a Phillips-head screwdriver. This should be the first screw to remove.

  6. 6

    Carefully remove the motherboard to gain access to the battery by disconnecting the small strip attaching it to the rest of the phone. There should be a tab at the top of the battery; this is where you should cautiously pry the battery with the flathead screwdriver and remove it from the phone.

  7. 7

    Take the new battery and place it where the old one used to be. Once the battery is secure, reassemble the phone.

Tips and warnings

  • Keep track of all screws and other parts removed from the phone while you work. Losing even one piece can lead to undesirable results.
  • All tasks requiring disassembly of any electronic equipment should be carried out at your own risk. Mistakes and accidents could further damage your equipment and/or stop it from working.

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