Ok, I just remember seeing some chargers with like a 9000mAh battery limit or something like that. I do realize that beyond 5000mAh it will take a bit extra time to charge but I could still charge two Lipos at once if I got two of them vs single 8amp passport ultra. I think I still come out charge time ahead if my math is correct

For a theoretical example:

Four 2s 7000mAh Lipos w/single Passport Ultra @ 7amps = 1 per Lipo = over 4 hours to charge

Four 2s 7000mAh Lipos w/ two AC6 @ 5amps = approx 1.5 per set = approx 3 hours to charge

If I factor in doing a 3S 5000mAh Lipo or above i'm looking at at least 1.5 hours per Lipo on each AC6 due to wattage limit.

Hmmmmm......