Had to use pliers to slowly pull the battery free by it's tab. When you reverse the steps to reassemble the phone - make sure to get all 6 (or 7 for the 3GS) cables plugged back in. I forgot connector 5 and had to take the phone back apart. Then realized the next day I also had missed connector 6 (wifi). So because I reassembled too quickly the first time - I got to do all the steps 3 times! But phone works perfectly now with a new battery.