Syma x5c battery box

So I made this to fit the BTG 780mah batteries that you can get on amazon for the wltoys686.
It will fit either where the camera goes or on the top of the x5c. Not sure if it extends the flight time but I have 5 of them so it was worth making this. The down side is the x5c can't lift much so I noticed with the larger battery is can't recover from a altitude drop. Need to figure out a way to boost the thrust. Anyways hope it helps someone.