Hello, looking for some help, I have bought a thunder power 610c charger and a thunder power 2s 3300 battery. So I have plugged the battery into the little balance board and set the battery to charge at 3amps on 2s mode but I'm getting a wrong polarity, check voltage warning. I have no idea what to do from here, there is a small red and black cable in the box with male ends on one side and seemingly nothing on the other. This is the first time I've attempted to charge any sort of RC battery and it seems quite overly complicated, the instructions are diabolical! Any help would be much appreciated.