I have a J35XNT S# K160N that throws a code 65299 when you tilt all the way back but all hydraulics still work but it drives like the brake is on and now I have a code 13368 but see no change in the unit. Battery has 2.1 across all cells and 1300 specificgravity across all cells but when driving the unit battery voltage drops from 42.6 volts to 35.7 real fast. any help would be greatly appreciated.

Thanks