Well,I've just checked, and my FP 5350 F3A packs weigh 1154 grams+/- a few grams, including the leads and 6mm plugsand I have my timer set at 8' 30"-and have never got to 4000maH on a flight(except the once by mistake on forgetting the timer of course)-so presuming that that's what you mean(not 4350).
8 1/2 mins is enough for one P09/F09, plus a few extra manouevres, so enough-but still less convenient for practice than most ic setups.