Battery holder for quadcopter

This is a battery holder for quadcopters. This holder allows a solid mount of the battery, so it doesn't wiggle during the flight, and it allows to do acrobatics without losing the battery in air.
I use it for the quadcopter with a frame Q450 V3 from Hobby King, but it can also be mounted on other frames. To mount this holder you can use 4 M4 holes on the bottom of the holder. To fix the battery in a holder one can use standard battery straps. Battery holder ca be mounted either on top or on the bottom of the frame. In my example it is mounted on the top.

It is designed for two types of batteries:
1) 119(length)x35(height)x32(width)mm, for example Turnigy nanotech 2.2 4S, 25-50C
2) 175(length)x49(height)x38(width)mm, for example Turnigy nanotech 6.0 4S, 25-50C

There are three STL files:
1) the complete structure
2) Structure cut in two pieces to print it with Printrbot Simple Wood. You can glue two parts using glue for hard plastic.

Enjoy!