I bought an AGM battery a while back (can't remember exactly how long ago), installed it and drove the bike a few times before I had to garage it for several months for a gas leak. I recently fixed the gas leak (finally), and realized the battery was dead. I put it on a slow charge (2 amps) for a day or two, but it didn't hold the charge. I tried to jump it from my truck, but kept getting sparks. The cables also got very hot and started to melt the plastic on the battery. I have jumped it from my truck before with no problem, any ideas as to what is going on?