I need a charger too, the one I have now only charges my 4s 6700mah battery at 3.2amp so when they say a charger does 7 amps, thats just on a 2s battery?because it will charge a 6700mah 2s at 6.7 amp but not the 4s.. what charger will charger my 4s battery at the 6.7 amps on my 6700mah