Liquid damage, only works plugged into AC, charging light green, help
I spilled liquid on a protected (covered) keyboard, causing liquid to roll to the back and enter machine and enter there. Attempted to dry for days without success. As a hail-mary, I cracked it open, did some basic topical cleaning, and then it turned back on! Unfortunately, I noticed that it would not stay on, and now will only work plugged into the wall. It starts with a 1% battery, but when you log in, it turns to 0%. When you unplug from wall, it immediately turns off.
I am an amateur, so did a lot of research, and tried the following:
(1) thoroughly cleaned logic board etc with alcohol. Did not notice anything corroded that jumped out at me, but not sure what I am looking for. I did notice on red dot (sensor) on the upper right side of the logic board. All sensors on the battery were white;
(2) replaced I/O board (no change);
(3) tore everything down to clean, re-set battery (no change). I did, however, notice that one compartment on the battery appears to be filled with a little air, like it is expanding for some reason;
(4) re-set SMC and PRC
I hear that there is a "charging circuit" on the logic board, but I can't find it. Can anyone help me identify what the problem is, please?? Ive attached logic board pics can someone tell me what I am looking for?