Been there, but I loose the damn screws
This is a boring “me too” answer to annoy the El Reg readers who hate Macs because they put them out of a job.
I too had a battery problem with a ten-year old MBP which admittedly was in semi-retirement as I had eventually decided to buy a new one. Most spectacular as the battery started swelling and was threatening to distort the housing. I managed to release the pressure by removing screws but, of course, managed to lose one. When my replacement battery finally arrived I had found a YouTube video of how to install it (come on Dabsy, you did too) but the “free” screwdrivers that came with the battery were so pathetic that I had to shell out for a decent one to remove the old battery. Finally put it back together minus a screw, but it’s not quite flush any more and will scratch the table top if I’m not careful.