I have a Cat NOR30P, serial number 2LL-00846, that is currently showing 0% on the BDI even after charging overnight, which is not allowing anything except low speed to function. The vehicle manager shows a "10" in the display. Battery voltage is 24.67, drops to 23.45 during travel. Checked battery cell voltage and all are above 2.0. I also tried a battery from another unit and still have 0%. Any ideas???