Took the battery out of the jetski because someone else insisted on charging it...?

Question

Now, I put it back in and reconnected it and it doesn't turn over at all...like there is no battery...Is it connected back wrong, or is there something else that could be a serious problem?

Answer 1

It sounds like the battery cells dried up, and this means the battery is shot.

Answer 2

Check the battery with a multimeter or battery tester your friend may have ruined your battery.