I knew all this stuff when I was researching chargers but the formula slipped my mind. How do I determine what the charger can do for a charge current (amp)per channel? I have a x2 400 hitec which is 400 watts per channel (x2) capable of 20amps per channel but I am only using a 20amp Trakpower power supply. So I know the charger can do 20 amps but I also know that 20amps per channel is limited by the power supply I am using and the size of the battery. Say for this calculation I am charging a 4s/6500mah/65c lipo. Can someone write out how to calculate it.