Question about the Hyperion EOS0610I

[BrianG]

Don't know about the first part, but chargers are around 80% efficient. To utilize the full 250w output capability, you'll need a PS that will supply at least 313w. Make that 350w to add in a little headroom (never good to push things to their absolute max). 350w @ 12v = 29A. 350 @ 14.5v = 24A.

But like you said, you only need ~150w to charge that 6s 6Ah pack, which translates to ~220w figuring efficiency losses and headroom. 220w @ 14.5v = ~15A.