Anything related to upgrading the Vextrix VX-1 battery pack

I purchased a used 2008 Zapino in May, 2012. I've had problems with the battery. First, the switch went out. (It no longer turns off charger) Now, when I charge the bike, the red light stays on. After 12 hours charge, I unplug charger and the light goes green for about 5 seconds, then of course both lights go out (power and charge indicator). Has anyone had this problem? Will I ruin the battery charging 12 hours (overnight?) Would a new batter charger help?