I had this happen on my vp2 more than once. The problem was that the rubber ring dividing the middle connector and the outside ring ripped a little bit from being too tight so the two connectors touch when i tightened it down. I was able to replace the ring because i had some old battery connectors and it was a fairly easy job. But i would definitely not recommend you try anything like that yourself unless your ready to really mess things up, i did end up breaking off the positive wire and had to resolder it back on. Bottom line i would say it would be best to just send it in for repair and get it over with because more than likely its only going to get worse.