I was having trouble with my battery today. I rode it Sunday with no problems, left the tender off Monday and did not ride, tried starting this AM with a black screen. Put tender on for three hrs while I was gone, pulled out battery to take to a bike shop around the corner from whom I bought the battery in August. I thought there may have been a bad cell or plate loose. It was fully charged and no shorts. Reinstalled battery. Top clamp is a joke. There was a little corrosion on the negative side of all places. Cleaned it off. When I tried to hook up the negative side it was energized with some sparking but the positive was not hooked up and neither was the tender. It started better than ever before. Why was the negative side sparking before the positive was bolted on?