Macbook Not Recognizing Battery. What's Wrong?

Macbook not recognizing battery. Help!
So I recently got a macbook to refinish. It was working when i got it, just dandily (minus the screen being broken) so i replaced that, and it was ... working great.

Then I recolored it... still working great

Then I accidently drilled through a piece of the piece that goes from teh logic board to the battery (the end that is screwed into the battery compartment and touches the battery (the screw was completely messed up and after many non-drilling attempt to get itout, i had to drill it out and slipped.

Anyway.. not a huge deal. I actually managd t put it back together and everything still worked, and funnily enough it still ran off battery power, it just coulnd't charge the battery or recognize that the battery was indeed there.

So I bought a replacement piece for that cord, took the old one off the logic board and put the new one in.

Should work yes? No. still the same problem! it can't recoginize or charge the battery!

now I ASSURE you that I didn't hurt/drill/mess up the actual logic board, this was far away from the board itself, just the tip of the battery piece/cord by the screws... AND i tried resetting the new cord a few times too to make sure it was attached to the logic board correctly. is there something i could be missing?

So... what could be the problem? I am stumped! It should be working fine as I replaced the piece and everything. What are the chances I got another faulty piece?

It also doesn't turn on with the power button now, it takes a few tries, the keyboard and everything works,but could the power button itself be messed up? Not sure how JUST that part of hte top case could have been affected.

How else can you turn on a macbook other then that button? is there a way to just replace that part without replacing the whole top case?

This is very very bothersome, since everything was working fine and even working (not recognizing the battery) after the recoloring.

Any help would be greatly appreciated.
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no charring or anything... and like i said it booted up after that incident and worked, it just wouldn't charge the battery. hmmm

secondly, I just find it odd that the connector would be messed up, since the keyboard and trackpad and everything else works on the top case piece EXCEPT the power button. It would be quite a feat I'd assume to just mess up that one part of the connector cable...