Ryobi 18v. Lithium says fully charged but no energy
The classic fix for electronics that have been dunked in water is to put the item in a sealed plastic bag with a bunch of uncooked rice for at least a few days. The rice will draw the moisture out of the electronics, and you might get lucky.

Alternately (and I have no personal experience with this), it seems like Ryobi has a good warranty policy. If the rice doesn't work, you might try that route.