chargers

[BrianG]

There are a bunch really. Just look for anything that will charge at least 4s @ 5A, and has at least an 84W power limit. For current hyperion models, that's EOS 0720i and EOS 0610i DUO2.

Edit: And those take anything from 11v to 28v for the power supply. For a given power, using a 28v supply will require a little less than half the current that a 12v supply would require.

[lincpimp]

Since the 720i just came out, the 610i chargers are selling cheap... Look around and you may find some deals. The 610i is a 250 watt max charger and will do what you want, but will require a 25amp power supply (min) to push out 250 watts.