Introduction

How to replace the PRAM battery on your iMac G4.

Image 1/2: Using a  Phillips #00 screw driver, remove the four 6.86 mm screws from the metal plate. Image 2/2: Using a  Phillips #00 screw driver, remove the four 6.86 mm screws from the metal plate.
  • 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.

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Image 1/1: The four screws do not completely separate from the metal plate.
  • Remove the metal plate from bottom of the iMac G4.

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

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Image 1/2: These tabs lock the module in place and releasing them will cause the module to "pop" up. Image 2/2: Remove the RAM module from the iMac.
  • 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.

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Image 1/1: This step is only applicable to iMacs that came with an AirPort card installed.
  • 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.

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Image 1/1:
  • Remove the four 28.07mm Torx #15 screws from the lower case.

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Image 1/2: Open slowly to ensure that no cables are damaged or disconnected. Image 2/2: Open slowly to ensure that no cables are damaged or disconnected.
  • Open the base by carefully pulling straight off, do not rotate the cover.

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

You can skip steps 7-9; there is no need to disconnect any internal wiring or RAM. Crack open the base a couple of inches (it doesn't really rotate, just pull it out), and the PRAM battery will be right under your nose. It's no problem to pop it out with your fingers and put the new one in. Just make sure that you note the positive and negative terminals on the old one, and put the new one in the same way.

whshep - Reply

No one mentioned the need for thermal paste in the reassembly...

Federico Jimenez -

Thermal paste? Where would you put that? As I understand it there's no need for that anywhere other than the CPU/Heatsync

Steven Hatch -

There's a post (or block really) that connects the cpu heatsink to the upper part of the metal shell that is just to the right (facing the imac) of the drive door. Upon reassembly it's best to clean the matching surfaces and reapply thermal paste to that upper post.

Joe Pena -

what's with the apparent loose black wire visible in step 6 & 7 ?? same as the loose wire just sitting there in step 3 ( which was like that on mine, just loose.....? )

rickcee44 - Reply

I hear that wire is bluetooth hook up.. my model has the other side but my board doesn't have the hook up... go fig :(

sean -

Image 1/1: Do not pull directly on the colored wires.
  • 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.

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Image 1/1: Do not pull directly on the ribbon cable.
  • 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.

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Image 1/1: Once the tabs are pulled the module will "pop" out and you can slowly remove it.
  • 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.

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Image 1/3: Remove the PRAM battery Image 2/3: Remove the PRAM battery Image 3/3: Remove the PRAM battery
  • Use a spudger to gently pull the side of the battery out of the socket.

  • Remove the PRAM battery

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Conclusion

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

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

CPSU-AMIDO-F11S5G32

4 Members

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One Comment

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

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