I have an X-1 whose battery shows a 3/4 charge with no voltage at the output terminals. When I attach a charger to the battery, it immediately shuts off like the battery is fully charged. I checked the input barrel connector and it shows voltage. The on/off switch shows contunity. Do you have any suggestions like maybe the BMS needs a reset, which I don't know how to do, or is there a way to narrow down if it is a bad BMS. Worst case, could you recommend a reputable rebuilder? Thanks, Bob