Originally Posted by
brandon32689
Actually my 4s says up 13.5 amps and my 2 s 7200mah says charge rates up to 6c does that mean 7.2x6?
Yep, max charge rate is the MAH of the battery times the C charge rating. So the 7200mah pack can theoretically be charged at 7.2x6 = 43.2 amps.
I've found a 20 amp charge rate to be good speed. What is nice though with a 40 amp charger is you can parallel charge a couple packs at 40 amps. Very handy, especially if you run dual packs in something like a 1/8th scale.