Another to add to the wish list. A footprint for one of the many small buck converters to power a DSLR / mirroless at 7-8 volts via a dummy battery.
This is the one I have www.banggood.com/5A-XL4005-DCDC-Adjustab...rch&cur_warehouse=CN
The dummy battery is something like this. www.banggood.com/External-Power-Supply-A...601&cur_warehouse=CN
I managed to find a unit with no power adapter on fleabay for my Nikon

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