5 Replies Latest reply: Jun 3, 2008 10:25 AM by Jack Harris1
Jack Harris1 Level 1 Level 1
Ok, after having some problems with the date being reset and failure to startup, I thought the most likely cause was that the battery needed replacing.

I found some instructions at http://manuals.info.apple.com/en/Battery.pdf which does show how to replace the battery, but this must be for a different model of G5 to mine as the battery holder is completely different. (Mine is held horizontally in a black plastic enclosure, rather that being held in place by a metal clip, which appears in the instructions.)

The problem is, the old battery kind of 'flipped' out when I was removing it, so I can't tell which way round it was, and there are NO markings on the battery holder indicating which side should be positive and which should be negative. I don't dare guess in case something bad happens if I put it the wrong way round.

I'd greatly appreciate anyone's help who knows which way round this battery should go - ie positive terminal facing towards the front of the Mac or the back.

By the way, there is a link on the Powermac support page that looks like it should go to the "do-it-yourself repair and upgrade page", but when you click on it, it takes you to a page that asks you to put in my serial number, then tells me that my machine is out of warranty and 'helpfully' redirects me back to the Power Mac support page.

dual 1.8 G5, MB C2D 2.0, Mac OS X (10.4.11), 1.25 GB RAM
  • adsfushi72 Level 4 Level 4
    Do you know what model your G5 is?
    (Late 2005, Early 2005, etc.)
  • Thomas Bryant Level 6 Level 6
    Hi! Have you examined the motherboard closely with a magnifying glass? I don't have one to check but if it's the cylinder type battery (like a AA except 1/2 the size in length) then I would think it would be marked in tiny markings on the MB. If it's the "coin" type the + goes up. Tom
  • Jack Harris1 Level 1 Level 1
    Well, I found out which way round to put the battery (I found a picture somewhere on the net of a motherboard the same as mine with the battery installed and copied that).

    However, it hasn't solved the problem, that the machine still sometimes fails to start up and the clock is sometimes reset when it does.

    Any other ideas what could be causing it?

    (By the way, the model type is G5 power mac June 2004
  • DaddyPaycheck Level 6 Level 6
    Hi Jack Harris1-

    Did you try another battery? Is it a name-brand battery from a reputable source?

    When you say that it still fails to start up and the clock is reset is it better than it was?

    If the machine is now better than it was, but still exhibiting the same symptoms, the cheapest thing to try is a new battery. If things are the same you likely have a different problem.


  • Jack Harris1 Level 1 Level 1
    Yeah, I used a new battery. It's not the same brand as the old one, but is the same size/type. I guess it's possible that it's a dud, but I bought it from the same place I got the Mac from so I think it's a 'reliable source'.