Won't charge. Says battery too hot.

I jumped in the pool with my watch on and found out it didn't like it. The screen flickered, but wouldn't come on. Using the tear down video and a 64 piece bit set both from ifixit, I was able to take the watch apart and let it dry out. After that I tried to charge it but got a triangle symbol message with a thermometer in it and it wouldn't charge. I left it off of the charger over night, then put it on the next day and it charged right up and behaved normally! Sadly, when the day was over and I went to charge it back up I got the same warning and it wouldn't charge. I employed the same method as before and it does charge after a few hours off the charger to "cool down"?? Has anyone else had this proiblem? If so, any advise?