1)take out the battery

2)let the battery dry for 2 days...and make sure it completely dried

3)now connect the battery to the laptop see if it works?

if it doesn't work?

simply replace with new battery

good luck take care :)

A well coated battery takes no damage in non-hard water. But in normal conditions battery can get damage irreparably. You should take it to a hardware store for repairs.

Just get a new battery

They might repair it but it still won't be new