Here are the detailed specs, features, pros & cons of the Tether Tools Relay Camera Coupler for Sony NP‑FZ100 Battery (Model CRNPFZ100):
Tether Tools Relay Camera Coupler — Sony NP‑FZ100 (CRNPFZ100)
What It Is
This is a dummy‑battery coupler designed to replace the Sony NP‑FZ100 battery in compatible Sony cameras. When used with the Tether Tools Case/Onsite Relay Camera Power System, it allows continuous external power (via USB power banks, AC adapters, or similar 5V sources), instead of using the internal NP‑FZ100 battery. The coupler itself does not hold a charge—it just bridges the external power to the camera.
Key Specifications & Compatibility
| Specification | Details |
|---|---|
| Replaces | Sony NP‑FZ100 battery pack B&H Photo Video+1 |
| Compatible Cameras | Sony α7 III, α7R III, α9 B&H Photo Video+1 |
| Coupler Cable Length (just the coupler) | ~ 10 inches (~ 25.4 cm) Robert's Camera+2Glazer's Camera+2 |
| Total Cable Run (with the Relay cable) | ~ 50 inches (~ 127 cm) Robert's Camera+1 |
| Connector Type | Barrel/coax female input (built‑in cable to attach into the Relay power system) B&H Photo Video+1 |
| Items Included | The coupler only (dummy battery insert) with built‑in cable; Case Relay power system sold separately B&H Photo Video+1 |
| Warranty | Limited ~ 90‑day warranty (standard for Tether Tools Relay couplers) Tanotis+1 |
What It Enables / Benefits
Continuous Shooting / Video / Live View
Since it removes dependency on internal battery power, you can shoot long sessions (video, streaming, time‑lapse) without the worry of running out of battery.
Hot‑Swapping External Power
The Case/Onsite Relay system includes an internal buffer battery. That means you can swap external power sources (power bank / AC adapter) without the camera shutting off. Useful on long shoots or when using wobbly power sources. Robert's Camera+1
Cost & Convenience
Instead of carrying multiple NP‑FZ100 batteries, you use standard external power sources. Also reduces downtime (no battery swapping).
Flexibility
If you have multiple cameras across different brands, you can get couplers for each and use one Relay power base. Swapping dummy batteries is easier than managing many proprietary batteries/time.
Things to Watch Out For / Limitations
| Limitation | Why It Matters |
|---|---|
| Battery Door Closure & Cable Routing | The battery door must be able to close fully over the dummy battery, and the cable should exit via the camera’s rubber/trap‑door or designated cable aperture, so there’s no strain on the cable or door hinge. Improper routing could damage the camera or cause cable wear. Studio Depot+1 |
| No Power Storage in Coupler | The coupler itself does not provide power storage. If the external power source and buffer battery are depleted, camera power will cut off. Planning backup/monitoring is important. |
| External Power & Cable Quality | In high draw modes (video, high frame rate, etc.), you need a reliable external power source and good cable to avoid voltage drop, flicker, or instability. |
| Compatibility | Although advertised for certain models (a7 III, a7R III, a9), ensure your specific firmware and camera body work well with third‑party or “dummy” battery couplers, especially regarding warnings or safety prompts. B&H Photo Video+1 |