An idea for Blackmagic and/or accesories makers.
Why not take advantage of the space in front of the camera on the EF models? . It is known , more battery is needed.
I hope , anyone who could do it send me one free of charge for the idea ..

I´m sure, we prefer this solution instead of a big rig with an V-Battery or anoter battery accesory on the button of the BM...