This is not fishing related but I know that most of the people on this board are quite knowledable on these types of things. I have a 2015 sea doo which we purchased last year.
I removed the battery for the winter and stored it in the basement. I was charging it this spring and after a while could here it "boiling" for lack of a better term. So I disconnected it out of caution. I noticed it has 2 lines on the front "lower level" and "upper level" the level seems to be at the lower level. It showed as charging but that was after 3-4 hours. It was working fine when I put it away. Also I am not home to charge it through the winter and am uncomfortable leaving a trickle charger on it inside the house so likely it did discharge fully.
My question is can I add electrolyte to it and charge it in a safe place (outside likely)