Here’s a professional overview of the Tether Tools Relay Camera Coupler CRPBLF19 (for Panasonic cameras with DMW‑BLF19 battery) — what it does, specs, compatibility, benefits & caveats.
Tether Tools Relay Camera Coupler – Panasonic Battery DMW‑BLF19 (Model CRPBLF19)
What It Is
The CRPBLF19 is a dummy battery (camera coupler) that replaces the DMW‑BLF19 battery in certain Panasonic Lumix cameras. It’s part of Tether Tools’ Relay / Case Relay Camera Power System. The coupler itself does not contain a battery; instead it lets the camera draw power continuously from an external source (e.g. USB power bank, AC adapter) via the Relay power system.
Key Specifications
| Spec | Details |
|---|---|
| Compatible Battery | Panasonic DMW‑BLF19 B&H Photo Video+2Tether Tools+2 |
| Compatible Cameras | Notably: Lumix GH3, GH4, GH5 (models using the BLF19 battery) B&H Photo Video+2Polyline Corp+2 |
| Built‑in Coupler Cable Length | ~ 10″ / ≈ 25.4 cm from the battery dummy to the barrel/coax female input jack B&H Photo Video+1 |
| Combined Cable Run (with Relay Cable) | ~ 50″ / ≈ 127 cm when used with the Relay power cable (coupler + Relay extension) Glazer's Camera+2tethertools.es+2 |
| Connector Type | Barrel / coaxial female input for connection to the Relay power system B&H Photo Video+1 |
| Warranty | Limited 90‑day warranty from Tether Tools (typical for Relay couplers) Tether Tools+1 |
How It Works / Key Usage Notes
Insert the CRPBLF19 dummy battery into the camera’s battery slot (where the BLF19 battery normally goes). B&H Photo Video+1
Ensure that the battery door can fully close, with the dummy battery installed, and the cable exits via the rubber trap door (or built‑in flap) so the door isn't forced or strained. Tether Tools+1
Connect the coupler’s barrel input to the Case Relay / ONsite Relay power system. External power can be supplied by USB (power bank), AC adapter, etc. Polyline Corp+1
Because the Relay system has an internal backup battery (~ 1,200 mAh), it supports hot‑swapping external power sources without interrupting camera operation. Tether Tools+2Tanotis+2
Benefits
Continuous / Long‑Duration Power — Ideal for video, timelapse, live view, or any scenario where battery life is limiting.
Reduced Need for Multiple Proprietary Batteries — Using standard external 5V sources can be more practical & cost‑efficient.
Hot Swap Capability — The internal buffer means you can change external power (e.g. power banks) without stopping or losing power.
Flexibility Across Camera Systems — If you shoot with multiple brands, having couplers for each allows one Relay power base to serve several bodies with minimal extra gear.
Limitations & Things to Check
Coupler doesn’t store power itself; if external power fails and the Relay buffer is drained, camera will power off.
The battery door must close properly; improper routing or forcing the door can lead to damage or poor fit.
Ensure that the external power source and cables are sufficiently capable (good current, low voltage drop), especially under heavy draw (video, live view).
Compatibility should be double‑checked: even among BLF19‑battery cameras, some minor differences in door/case design may affect how well the dummy fits or how cable routing works.
Because the setup adds a dummy battery + cable, there may be mechanical stress at the battery door / port; strain relief is advisable (clamp, support etc.).