/diy/ - Do It Yourself

Hi /diy/

My quad-copter project is nearing completion. Here are it's design goals
1- Flying weight not to exceed 250 grams
2- Should be somewhat fast and agile
3- Have as long an endurance as possible

My question to /diy/: How would you go about improving endurance? My thoughts were to motor it for 250 grams, build it as light as possible, then fill in the remaining weight with battery. Currently, the weight not including the battery is about 120 grams, and the battery itself is about 120 grams. I am using 1306 3300kv motors, and the batteries are 3S around 1400-1500mAh.

It has not flown yet, so I do not know what kind of flight times I am getting. I am wondering if I may actually get better flight times using lighter (lower capacity) batteries and/or smaller or larger motors.