Ok so sounds like you already reset the SMC (there is a Apple support article with how to do that). I would also suggest resetting the PRAM (https://support.apple.com/en-us/HT204063).
Agreed. It is very difficult to get the screen back down. Not sure if that was (at least for me) a result of the force sensor not being installed correctly? That was the most difficult part was getting it to fit.
Does anyone else have an issue once the battery is replaced and recalibrated but still draining very quickly? Is there a way to “recalibrate“ the battery again?