Reading the comments & learning from others who did this was as important as the ifixit guide (which is a really good guide, compared to the others I read). Thank you for making this available! Local service & repair guys told me I had to have Apple people replace my battery. I ordered one from amazon, along with a new back cover (mine was shattered from flying off the dashboard during a turn & crashing on pavement). Both the battery & the cover looked exactly like the originals & included all tools & replacement screws. I was hesitant to attempt the repair but if I paid Apple prices, we wouldn't eat this week. I read the ifixit guide all the way through twice & ALL the comments before starting. The best advice was in Comments, about the battery connector needing to be bent before installation. The whole thing took less than 30 minutes, the screws didn't strip, &everything connected smoothly & correctly, thanks to this ifixit website. The battery was good & I have had NO problems since I did this repair.