park flyer battery ?

Probably, you will end up getting it wet eventually. What you can do is construct a cooling tube though. Just put a fan (12v computer fan or whatever) on the end of a piece of PVC pipe or similar and put the battery in there, should cool it down a lot faster than normal and you won't have the danger of having your battery near water.

I usually fly infront of my house so if my batteries get hot at the end of a flight I just put them in the freezer for a few minutes before I recharge them.