Although I put it together anyway with the broken battery connector pin and it worked, it would not charge. iFixit is out of replacement motherboards. It may be that the thumbprint button is keyed to your original motherboard, so changing either without the other will lose that capability? It cost the same as a motherboard to ship it out for micro soldering a new battery connector. The connector is like $2. I ordered one and will take my chances microdesoldering the old battery connector off and micro soldering the new one on.

I broke a pin here. My kit came with a tool that resembles a pick with a cutout, so I used it, rather than modify a pick. It would not stay in as pictured and would not go in as far. So I kept pushing it in and expecting it to go further. There is an opportunity for more detailed explanation here. I was able to bend back one of the small pins, but the other bent one broke while I attempted to bend it back. So, there were 3 little pins, now there are two. I put it back together, anyway, and am happy it all works. I am hoping it is a redundant system, and will not overheat the battery right away and explode. If anyone knows the tale of the three little pins, I would like to know.