Here is a solution I found to get more battery power on longer shoots. I wanted a compact solution that I could use handheld if necessary. I set this up for my Lumix GH5 but the concept will work for most DSLRs.
SmallRig Dummy Battery DMW-BLF19 (Shipping Area: North America) 3248
https://www.smallrig.com/smallrig-dum...
Here are the links for the items that I mention in the video I removed the extension cable link from amazon because there were some incompatibility issues that were pointed out in the comments and replaced it with a link from B&H that has the correct extension cable.
My friend Frederic Cervini pointed out in the comments that the extension cable that I use has a pin in the female end that compromises the integrity of the connection to the dummy battery that I show in the video and that I originally linked below. That cable was from amazon. Do not order that cable. I found the correct cable and provided the link below. Per Frederic there is a dummy battery from smallrig that works better with the smallrig battery adapter plate. Here is the link to that dummy battery here:
SmallRig Dummy Battery DMW-BLF19 (Shipping Area: North America) 3248
https://www.smallrig.com/smallrig-dum...
SmallRig NP-F Battery Adapter Plate Lite 3018
https://smallrig.com/smallrig-np-f-ba...
Wasabi Battery (The Big One)
https://www.amazon.com/dp/B001KNDN4Q/...
Here is the link to the dummy battery that I show in the video:
Core SWX Powerbase EDGE Cable for Panasonic DMW-BLF19 Devices
https://www.bhphotovideo.com/c/produc...
Here is the correct extension cable that works with the powerbase dummy battery.
Core SWX Powerbase Edge Cable Extension (18")
https://www.bhphotovideo.com/c/produc...
Camera: EOS R
Lens: Canon EF IS 24mm
Note: I forgot to turn on the shotgun mic so this audio is the camera's internal mic.