Battery not charging on MacBook Air after water damage and repair.

I spilled water on my MacBook Air 13 inch (early 2015 model). I immediately shut it down and found it would not power on again.

I disassembled it and put it back together. It now turns on, but only while it’s plugged in. Whenever the charger gets unplugged, the computer shuts down. Sometimes it randomly shuts down even while the charger is plugged in. My computer gives me this message:

Here are the battery specs from system information:

I’ve tried using another battery that’s been tested and works fine. I had the same issue, which proves that the problem is not a battery issue.

So what could the issue be? I’m thinking it’s something to do with the PCU or an electrical circuit issue. Could it also be that maybe I didn’t reinstall the I/O board correctly? Or that there’s damage on the I/O board/charging component? I’m not really sure how to fix this or repair it though. Any suggestions? All repair shops near me are closed due to the corona virus.

Thanks again!! I really appreciate the help.