Or, if your setup will handle the extra voltage, going to 4 cell is an option. I have a stock DJI 450 with the e300 motors/esc's, and I run a 4 cell 3300 mah. Setup with FPV, and a servo, for something else, and I have the timer on my Spektrum set to 12 minutes. Still have around 25/30% left when I land.