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i, too, use the yongnuos. I power vivitar 285s w/ them, as well as 580 and 580II.
i shoot indoor sports w/'em. W/ 4 or 5 flashes, i shoot on manuel, power the flashes
down to around 1/4 power and i can get 3 to 4 shot groups w/o much problem.
i use re-chargeable batts, eneloop is one of the better choices for these, IMO.
just a suggestion...purchase two or three quality chargers so you can charge large
quantities of batteries a time.
saves time and keeps fresh batts on hand.
discliamer: this is just what works for me, in the arenas' i shoot in.
hope it helps.