I was looking at some you tube videos and learned that with widening the door just a bit I can run the 5000mAh 3s lipos. This is great because I run the 3s 5000mAh Turnigys for my 1:5th scale truggy. Yea for me!!
Beario, go to youtube and just type in dji fc40. A ton of videos. Or look for big battery door modification.
For iflyinwy I don't weight the unit. I just want it in the air longer. It is not equipped with anything. Just box stock. No camera
I use this battery all the time with a gimbal and stock FC40 camera. flight time greater than 20 minutes.
http://www.hobbyking.com/hobbyking/store/__62884__MultiStar_High_Capacity_3S_5200mAh_Multi_Rotor_Lipo_Pack.html