[zeropointbug]

There isn't really a charger out yet that can do 5c charge on a 6500mah pack. I did 5c charge on my 2x 3s G3 packs and they sure can handle the charge, really quick! But now I just charge the two packs wired in series (wish i had got a 6s pack in first place), in un-balanced mode at 10 amps, quicker and more convenient than charging two separate packs. I check balance between cells every few runs, but they always are in perfect balance (around 0.002v).

You don't actually get a linear decrease in charging time per charge rate, it is merely the MAX charge rate during charge, the higher the C rate you set the charger at, you will hit CV phase after CC phase exponentially sooner, thus making the very top end of the C rate spectrum, the benefit seems to drop off a bit. I have found 4C is only a few minutes longer than 5C, and definitely not 25% longer, which it would be in theory.