I just purchased 36v 750 Eplus system. The previous owner had lost the charger. So I had to charge each battery pack individually. I was able to ride for only .5 miles. I recharged the batteries and I was able to travel .75 miles before the display started to blink and shutdown the system. After recharging them again. The display would only blink a couple of times before shutting off. Would this have to do with the PIC? Do I need to have the original Eplus charger?