MacBook only turning on when plugged in after screen replacement

I have a question about my macbook. I replaced the screen and messed up the battery flex cable in the process. I got a replacement cable and the computer turns on fine and works well (minus the touch bar)...until you unplug it. Im not sure what I messed up. Someone told me to replace the battery but it had been working fine before the screen replacement and the health status is fine. Is there another reason this could be happening?

On a side note, I knocked something loose. I'll attach it here to see of it's a part of the problem or maybe related to the touch bar issue