It's 50w per channel. So if charging at the max 6amps (50w/6) 8.3v or a 2cell lipo would be the max you could charge at 6amps. If you have a 3cell (11.1v) you can only charge it at 4.5 amps. If its a 4cell lipo (14.8v) you can only charge at 3.5amps.