One of the things that have always been an issue when shooting video is, “How many batteries will I need?” But finally the team at Tether Tools has the definitive answer. The Case Relay system eliminates your camera battery and replaces it with a connection system that lets you use almost any external battery or even AC power.
I have been working with the system for my Panasonic GH4 and it is a god-send. I absolutely love it. I can hook to my USB 5V battery pack and keep running non-stop. It’s compatible with most Canon, Nikon, Sony, Panasonic, Fuji, and Olympus cameras. A Relay Camera Coupler (sold separately) is required to use Case Relay Camera Power System.
It so simple but so effective. This definitely one of those “have to” items for your kit. Need more power? Hot swap in another power bank and continue shooting while never losing power to your camera.