I use a 1400 MA battery with a 969 brain charger and it takes about 10 min. to charge. The more channels you use and if you have digatal servos the more battery you use when you fly. I usally go 5 flights of 10 min. each before I charge mine. If you have the standard charger that you get with a radio then you would charge eather one overnite and they would be fine.