How to replace the PRAM battery on your iMac G4.

  1. Place the computer monitor face down on a safe, harmless surface.
    • Place the computer monitor face down on a safe, harmless surface.

    • Using a Phillips #00 screw driver, remove the four 6.86 mm screws from the metal plate.

  2. Remove the metal plate from bottom of the iMac G4.
    • Remove the metal plate from bottom of the iMac G4.

    • The four screws do not completely separate from the metal plate.

    • Release the tabs on each side of the module by simultaneously pushing each tab away from the RAM.

    • These tabs lock the module in place and releasing them will cause the module to "pop" up.

    • Remove the RAM module from the iMac.

    • Use a spudger to lift and remove the AirPort's antenna connector.

    • This step is only applicable to iMacs that came with an AirPort card installed.

    • Remove the four 28.07mm Torx #15 screws from the lower case.

    • Open the base by carefully pulling straight off, do not rotate the cover.

    • Open slowly to ensure that no cables are damaged or disconnected.

    • Squeeze the small black tab and wiggle gently to remove the colored power cable.

    • Do not pull directly on the colored wires.

    • Do not remove black grounding wire.

    • Grab both sides of the blue connector and firmly pull to remove it from the mother board.

    • Do not pull directly on the ribbon cable.

    • Release the tabs on each side of the module by pulling them away from the internal RAM

    • Once the tabs are pulled the module will "pop" out and you can slowly remove it.

    • Use a spudger to gently pull the side of the battery out of the socket.

    • Remove the PRAM battery


To reassemble your device, follow these instructions in reverse order.

3 other people completed this guide.

Ryan Kozak

Member since: 10/10/2011

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3 Guides authored


Cal Poly, Team 5-32, Amido Fall 2011 Member of Cal Poly, Team 5-32, Amido Fall 2011


4 Members

8 Guides authored


This is missing a description of re-doing the thermal paste which connects the heat sinks in the top part with the heat sinks in the bottom part. Check elsewhere on the internet for that (don't look at the other battery replacement guide here on ifixit, that one is criminal in how bad it is, I used to be impressed because that guy had the highest reputation in all of iFixit, now I realized he just gamed the system by putting up zillions of low-quality guides, and letting other people clean up the mess behind him.)

This heat thing is important, as your processor will overheat, and cause your mac to crash randomly.

Netmammal - Reply

Not bad indications, thanks, however the other comment is quite right. It is too important re- doing the thermal paste , as long as in this computer is needed in more parts than any other 'conventional' PC.

More over, once you have opened the mac, I would suggest to change the cpu thermal paste too.

Saying that, my point is that this is the second time I have to change the battery and I have faced a little problem assembling the external RAM (it wont click again) … and I´m still thinking why is mandatory (or at lest it looks like) to removing the external RAM and the airport card in order to open the other part of the computer?

At far as I´m concerned there is not phisical interference with the work, is it?

euato - Reply

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