I have a phantom...put the upgraded 900kw tiger motors in...three bladed masterscrew propellors....flies like a rocket ship. Have fat shark fpv on and dual 2500 batteries...can maybe squeak out 5 minutes of flight time. Flies perfect in every way. Tried one battery at a time....would only last a minute each. Tried (2) 2200mha batteries, no better....3-4 minutes. Motors do not seem to be heating up......everything seems in order, i just can't figure out what could be the big draw. Have a micro switch installed to shut off the fpv...so there is no draw there either. Anybody else run into this? Weight is 1300 grams.....i know the max recommended is 1200...but with these motors, props and batteries 1300 should not be a problem....would appreciate everyones thoughts. I have two 5000 mha batteries ordered..but i am thinking something is not right....i hope i didn't waste two hundred bucks on the upgraded motors??!!!