Laptop Battery Test

I am having trouble with my macbook laptop. The battery does not charge and when I load into the OS (with power cord plugged in) the battery program in the tray has an X through it and when I click it it says "no batteries available." Does this mean the battery needs to be replaced, or the motherboard connector is bad? I spilled water on the laptop one night, the battery was in very good condition (being over 4 years old), and now what I wrote above - is happening.

Thanks,
foxyy