Tether Tools Case Relay Camera Coupler Panasonic DMW-BLF19

Coupler for Panasonic GH3 and GH4

The Tether Tools Case Relay Camera Coupler replaces a Panasonic DMW-BLF19 battery inside compatible GH3 or GH4 bodies. It connects the camera to the separate Case Relay Camera Power System for continuous external power. This coupler suits photographers and videographers who need uninterrupted operation during long sessions such as time-lapse, video production or photo-booth work. It eliminates the need to swap or recharge internal batteries during a shoot.

Check camera model and relay ownership

Verify that your camera body is a Panasonic DMC-GH3 or DMC-GH4 before ordering. The coupler only functions when paired with the Case Relay Camera Power System, which is sold separately. Ensure you have or plan to acquire that relay unit and a standard 5V USB power source such as an external battery pack or AC adapter. Without the relay system the coupler cannot deliver power to the camera.

Battery-port insert with external cable

The coupler inserts directly into the camera battery compartment, matching the DMW-BLF19 form factor. A cable routes from the coupler to the Case Relay unit, allowing the camera to draw power from any 5V USB supply. This arrangement removes proprietary batteries from the workflow and lets you use the same portable chargers that power phones or tablets. The connection remains secure during handheld or tripod-mounted use.