I doubt you broke the battery, however, a connection issue does seem to be the culprit. I know from my own experience with water damage that if the device is let to sit on its own without immediate action taken to correct the damage, the water will form rust/corrosion on the ICB and on soldering connections. Check all existing connections on the board to ensure no connections were lost or damaged. That can keep the battery from charging as well if the charge controller was damaged. Hope this helps.
WC