the volts that im comeing up with is when i plug it back in to my charger, im useing a thunder ac6, on the battery it self its marked 7.4v and after around 5 min of run time, the truck will move for a few seconds stop and move for a few again, try to steer it the wheels barley turn, hope this will help, also if a 2s batt is 8.4v and mine is marked 7.4v should i try and charge it to 8.4 or is that a no no , also the batt says 2 cell 7.4v 5000mah 3dc continudus/6dc burts, again thanks for any help