I'm trying to fix an ipod that I haven't used for a long long time. Anyways, I've taken out the battery and replaced it but it still only lasts for about an hour. In fact, I can turn it off and leave it sitting for an hour and when I come back the battery will be dead or so the screen says. I'm not really sure if it is the battery since I have just replaced it with a new one. Any ideas on what could be causing it to be doing this? Thanks.