Does my battery need replacing

About 3 ounces of water spilled over the top of my roomba. I received a suggestion to put it on the charger for an hour and the ibot people would call me back. Did not receive a call.

It did crazy things when I tried it again, like going around and around without picking up anything. I let it just sit for three days, hoping that any water would have evaporated. I took it apart and cleaned everything and put it back on the charger.

Now, every 9 seconds, it emits a few musical notes. Do I need a new battery?