Hi, can someone advise of the tools required for battery replacement are the same for iphone 3, 4 and 5? My current iphone 5 battery is failing me as it's at the 'consumed' stage but I'm still using it as long as possible. I would like to try the battery replacement for my old iphone 3 first, before attempting for my other iphone 4 & 5. I'm bit nervous doing the diy as I'm usually not great with technical parts. Thanks.