Need Help

[XPLimited]

De-winterized my seadoo a few weeks ago and had trouble starting but eventually got it running by spraying a little starting fluid in the plug holes. I let it sit for about a week started it up before taking it out at my house still had trouble starting but eventually got it running. I took it down put it in the water it ran for about 10seconds died out then wouldn't start. Went to a local motorcycle shop which sells batterys already prepped and charged bought one of them put it in and still nothing. I'm thinking it might be something with the kill switch? Or maybe gauges shorting out? The Positive cable on the battery is getting very hot and unless its hooked up to a charger it wont turn over. Does anyone have any ideas?