I have a P1 as well as an early P2V. The early P2V battery is 4800mAh and weighs 252 grams. Two P1 batteries, each at 2200mAh together weigh 248 grams. In as much as the motors are the same, with the exception of the shaft threading for the self-tightening props, I can only surmise the much longer flight times must be attributed to one of two things: 1) Prop design 2) Lower battery discharge rate. The later due to the former. Thoughts?