need help replacing iMac Battery

Dave wrote:

I have a friends snow iMac and it needs a new clock battery- I almost got the cover off but it's stuck. -I think on the lip thing that's around the CDRom slot. How do I get this cover off without busting anything? Am I missing a screw or something? It doesn't seem like it. Thanks...DaveC.... I think you are being very careful, which is very commendable. This is from the "Take Apart" for the 500 Snow. Before you begin, position the computer face down, resting the computer on an ESD mat or other soft surface.

1. Using a plastic flatbladed screwdriver, remove the VGA vented cover.
2. Remove the two screws near the flip foot.
3. Remove the video out access door from the bottom housing.
4. Remove the two outer screws located near the video out port. Replacement Note: The bottom housing uses two sizes of screws. The two shorter screws attach near the flip foot.
5. Pull the bottom housing off the computer. Now if you do have all the screws out the lower housing will lever away from the body of the computer. I usually just snap the cover away. It snaps in at the area you're talking about. Once this cover is off the power switch will be exposed. Be careful not to damage it as I have snapped them off.
6. Remove the six screws on the EMI cover.
7. Lift the EMI cover off thecomputer. Note: Be careful of the VGA output port. Remove the mesh metal cover over the logic board and the down converter. Replacement Note: Position the rear of the EMI cover into place first, positioning the EMI cover over the video port (if present). Continue lowering the cover into place by gently squeezing in on both sides, as you lower the cover into position. You can now see the battery, It should read 3.3 to 3.7 V If not replace. Good luck. Richard