I have an additional suggestion on placing the new battery. With the laptop case hinge away from you, I put a piece of masking tape from the bottom (closer) right corner of the new battery pack to the bottom left corner of the battery pack with some slack in it. This allows you to pick up the bottom edge of the batteries in an arc, and position and place the center ones first. I screwed in the battery controller, pulled the heavy plastic backing off of the batteries, then placed the center batteries, followed by the outside ones. be careful to stick the tape firmly. The last thing you want is the batteries coming free and falling to the case and sticking wherever they land. Good luck. This was the most stressful step for me. While you’re reassembling, give the fans and the fins of the heat exchangers a good dust with canned air. :)
I would really appreciate some additional tips on placing the new battery set. I attempted to adhere just the middle two by screwing in the battery management board, but unfortunately I dropped the batteries, and of course, they stuck immediately and needed to be pried out to be seated properly. One I got the middle two placed, I could then peel the backing for the outside four. It’s probably worth mentioning that the outside pair of batteries share space with the speaker assembly, so be careful placing those two.