It's easy to replace through the hatch unless you have big fat fingers.
I used a popsicle stick to pop up the bottom end of the battery. I
grabbed it between my index and middle fingers and carefully pulled it
out. Used the same two fingers to insert the new battery, nose in, and
then was able to push it into place with my index finger. As for
dropping it, a friend of mine in her late seventies managed to drop the
old battery while taking it out. She just flipped the iMac back over to
roll the battery to the hatch. Nothing was damaged. Takes more time to
disconnect all the cables and then reconnect them than it does to
change the battery.
> My situation is I have a failing pram battery in my iMac DV. I have a
> spare as a replacement
> but when I upgraded my HD last year I must have over-tightened one of
> the casing screws and now I can't remove the case to replace the
> battery. (It's one of the screws next to the kickstand, now totally
> threaded, it's head all mashed due to my trying to get it out).
> I know there is a way of replacing the batt via the ram access door
> but if I slip up and it falls inside the case....
> Anybody got any ideas, apart from the 60 collection/delivery and
> labour charge to fix it up I have been quoted? Can I get this*
> out any other way myself?