Okay so I drove my truck yesterday. Some hard bashing and jumps. After I was done running one battery was really hot. Maybe 130-140 degrees. Enough to shrink the shrink wrap even more. So I put it on the charger after it cooled and my Onyx 220 showed 5.99 volts. So I let it charge and the alarm went off within 20 min. So I started it again and I went for another 20 min and it went off again. The total volts was near 11.00, so I put it and the other fully charged battery in my summit and it would barely move. Then I put it on the charger for 3 min and then put it in my summit, and it lasted for about 5 min. So if anyone can tell me what is wrong, PLEASE TELL!!!