Thanks Jasperm, that info was a big help!
A very good guide. I have a few notes from my experience replacing my battery.
In step 13 the torx screws securing the interconnect board to the heat sink were T-8 on my Mac but T-7 worked.
In step 23 a short arm Torx key would be helpful. Getting them out tore up the heads of the screws and getting back in was difficult without cross threading some of them. Bondhus (model no. 31832) sells a set that might help.
In step 29 if you don't reconnect the power supply data cable completely your Mac fan will run full speed and the processors will max out.