Menace i am playing around with this idea of Lipo pack.
I got some 1800 packs and you can get bigger but dont see the need.
Problem is pack wont fit in std position on the G4S but it does fit in the reciever tray with some squeesing and moving the reciver to where the batt std batt locates.Is very important to have a regulater as well.
Overall i am not sure if it saves anything on the weight side but is definately a plus on the power for electronics and run time.
Just from this change its like you have new servos, works so much better and faster.