The most that charger can do is 200w total. To make your batts last longer you should charge 1A per 1000mah. Ex. a 4s 5000 batt. should be charged at 5Amp. That would need a 200w charger. So that supply will keep up with that charger.

For the money if you want more power you should get a server power supply. They put out 40 to 50amp, and a dual 400w charger like a Racers Edge twin 400 (it puts out 2 200w channels). With that you can do 2 4s 5000 packs at the same time charging them at 5 amps ea.