Any of you have one of these? I bought one a while back, and have had nothing but problems with it. It will not stay in place with a PC 545 battery. Within a few minutes of riding, no matter how much you tighten the black bar that holds the battery in place, it will move from flush with the bottom of the battery tray until the top of it is by the battery cables. Anyone had this problem and come up with a solution to make it stay in place?