I managed to get the battery out with some careful levering after one of the glue 'strips' broke and could not be rescued with tweezers. However, I had tried to save time and trouble by not disconnecting the screen first and came a cropper. I had used an elastic band to hold the screen vertical against a small, heavy box and that worked OK until the glue strip snapped and I nudged the box sideways a small amount. It didn't move far but it took the screen with it of course and that caused a tear in the cable going to the front facing camera and earpiece which resulted in me not being able to hear the caller in telephone conversations. The replacement cable and attached bits (camera, mic and one other sensor) was a ridiculously cheap £5.99 and the replacement, though fiddly, was successful installed but I would urge you to disconnect the screen as advised. I didn't primarily because I was concerned I may have a problem reconnecting the cables but it was no problem with good lighting and a steady hand.