CINE-X was showing a battery grip for the BMPCC 6K and 4K and IBC 2019.
The battery grip gets mounted underneath the camera and you can attach two Sony NPF style batteries of any size. These batteries can be hot-swapped so you can roll continuously.
The CINE-X solution has an LCD display that clearly shows you remaining battery times in both a percentage, as well as a voltage. There is also a remaining time estimate.
The battery grip can also power additional accessories via dual 12V D-taps and two 5V USB outlets.
CINE-X has also included wooden handles on the side of the battery grip so you can hold onto when shooting handheld.
The CINE-X Battery grip for the BMPCC 6K and 4K uses a dummy battery that has a cable that goes into the camera and then attaches to the powering solution.
There is currently no indication of pricing or availability, but we are trying to find out more information.