When the battery state of charge (SOC) is as low as you describe, the car is suppose to enter "forced charge" mode, ie, 3 or 4 green bars appear as you drive. The forced charge continues until your SOC is about 3/4 full. Then, as you cruise normally on flat terrain, the car is suppose to "hidden charge" or slowly trickle charge itself (no green bars showing) If yours is not force charging itself, there is likely something amiss. If you can get your SOC back up most of the way full, then try turning on the headlights as you drive, to charge it the rest of the way. Billy.....