Thunder dual power AC680
Ok still getting my feet wet. So i purchased this new charger (Thunder dual power AC680). I had a starter box givin to me with two 2200 nihm battery sticks 7.2v. i charged them on auto and they didnt seem to have the power to turn the motors. I think they might be the 550 motors, box looks old. So i set charger to cycle from disch/chg and only one battery cycled, the other has been discharging at .1A for 3 hours and still is in 7v range. Pls help do i just need to convert to lipo, start with a new box and batteries, or am i setting up charger wrong. Operating instruction are pretty vague, like i said im a newbie just gettin started. Any help is apprieciated.