Very nice.
Thanks for the link.
I'm tempted.
However I won't back it.
* No output between 12 and 20V for the BMPCC4K externally. So it can only replace the internal battery.
* no on/off switch
* Handheld or on a mobile tripod a single battery inside the camera is fine.
* On the shoulder rig multiple devices want to be powered, so a V-mount plate with serveral outputs and a dual NP-F to V-mount adapter is find and provides a nice counterweight.
* On the stationary tripod it replaces the internal battery of the camera yet does not have a second battery-slot to hot-swap for long events.
With a 12V output and 2 NP-F mounts on eiter side and/or a small internall battery to hot-swap
and an off-switch, it would be very interesting.
(and of cause it strays from the topic. "Batteries for the Pocket 4K" and if the statement that the camery body does not even turn on with (some?) 3rd party batteries is true. Not alternative power solutions for the Pocket 4K.)