Inspired from http://www.thingiverse.com/thing:2053710 I've decided to create this one with some features of my mind (cooling, screws ...). Many thanks to zaphi for his inspiration.
The electronic devices used are the same.
4 x TP4056 charging modules lipo/1A
1 x XL4015 step down module 5A (don't forget to set it to 5V)
5 x Walkera Molex 2 pin Cables