My 3G iPod's battery was running out of charge in a day so I thought I'd give replacing the battery a go myself. It all seemed to go okay but I found plugging the new battery in a bit hard as it's a very snug fit and I didn't want to force it and break something. I got it all back together but it didn't turn on so I put it on the wall charger and it started up okay, everthing worked. I left it on charge all night but next day as soon as it was off charge there was just a blank screen again. I took it apart again, it all seemed okay, so I thought I'd try the old battery, now THAT doesn't work either. What have I done wrong? it all works fine hooked to the AC power, but it seems the battery isn't getting the charge. I can't walk around with a power cord! Have I killed it? PLEASE can someone help! Thanks.