Try this -> http://www.finseth.com/parts/ipod.php
The KEY test should be run...
As to the battery, I'd wait till you run this test. You can find IPOD PARTS on google.com
My daughter has a 5G ipod video (bought 18 months ago) which recently developed a problem. The HOLD switch no longer works (doesn't keep the buttons and scroll wheel from functioning). It also seems the battery is draining more rapidly. She says that she can only listen to it for about 15 minutes after a full charge. I've already tried resetting it using the center button and MENU button, but that didn't work. I first suspected the battery was coming to the end of its useful life, but found a post on another forum where others are having a similar problem. One suggested that it might be the result of a recent firmware update, but no solutions were given.
It's no longer under warranty, but I'm willing to buy a battery kit if necessary. Before I do, I was wondering if anyone has had a similar problem and a suggestion on how to fix it. (I've already tried the troubleshooting guide on Apple's site.)