Do you get a power light on your mag safe connector? (if yes then I don’t know)
What status messages show in the battery menu bar item? (does it say battery not present, or battery needs service)
Apparently the IO board and IO cable can be easily damaged by water. The IO board controls whether to charge the battery or not, and the cable connects it to the logic board. The IO board also tells the power supply what coloured light to show. Also connects the USB port (the one next to the mag safe) and the 3.5mm audio. Do all these work?