Tether Tools' Case Relay provides continuous power for many DSLR and mirrorless cameras

The Case Relay Camera Power System from Tether Tools offers 'infinite camera power' for most DSLR and mirrorless cameras from Canon, Nikon, Sony and Panasonic. The system works via a DC coupler that plugs into both the camera's battery port and the Case Relay. The Relay plugs into either a 5V USB external battery or a wall outlet. Tether Tools says Case Relay, which includes a secondary 1200mAh battery, is a solution for time-lapse photography and other tasks that require uninterrupted, long-l...