Here are the full specs, features, and usage details for the Tether Tools Relay Camera Coupler for Canon LP‑E17 Battery (Model CRCE18), especially suited for cameras like the Rebel T6i / T7i / 77D etc. PROCAM Photo & Video Gear+3Polyline+3tethertools.ca+3
Relay Camera Coupler – Canon LP‑E17 (CRCE18)
What It Is
The CRCE18 is a dummy battery coupler that replaces the Canon LP‑E17 battery in compatible cameras. Used together with Tether Tools’ Case Relay Camera Power System (CPS), it lets you power your camera from external sources (USB‑power banks, AC adapters, etc.) continuously. It does not itself store power. tethertools.ca+2tethertools.ca+2
Key Specifications
| Spec | Detail |
|---|---|
| Model | CRCE18 B&H Photo Video+1 |
| Battery Type Replaced | Canon LP‑E17 Polyline+1 |
| Compatible Cameras | Examples include: EOS 77D, Rebel T6i (750D), Rebel T7i (800D), Rebel T6s (760D) B&H Photo Video+2PROCAM Photo & Video Gear+2 |
| Cable Length (from dummy battery to coupler input) | ~ 10 inches / ≈ 25.4 cm Polyline+2B&H Photo Video+2 |
| Total Cable Run with Relay System | When used with the Relay CPS cable, total run is ~ 50″ / ≈ 127 cm Tether Tools+1 |
| Connector Type | Barrel/coaxial female input (to connect to the external power cable) B&H Photo Video+1 |
Features & Benefits
Continuous / uninterrupted power: With the Relay system’s internal battery (approximately 1,200 mAh UPS), you can hot‑swap the external power source without losing power to the camera. Tether Tools+1
Reduces dependency on multiple LP‑E17 batteries: External power sources are more universal and often cheaper/ more accessible. Tether Tools+1
Ideal for long shoots / Live View / video / timelapse: Where battery drain is a concern. tethertools.ca+1
Portability & flexibility: Useful for outdoor / location shoots where AC may not be available or battery swapping mid‑shoot is burdensome.
Things to Be Careful About / Limitations
| Consideration | What to Check / Beware |
|---|---|
| Battery door closure | You must be able to close the camera’s battery compartment door fully (often via a rubber trapdoor) over the coupler cable. If the door is open or not properly sealed, there may be risk of cable strain or wear. Polyline+1 |
| No onboard battery | The coupler doesn’t store power; if external power fails and you’re not using the Relay buffer/UPS, the camera will power off. Tether Tools+1 |
| Current/voltage considerations | The external power source must meet the camera’s power requirements; cable quality matters to avoid voltage drop especially under high draw (video, Live View) conditions. |
| Compatibility confirmation | Always check that your camera model is listed as supported; even within LP‑E17 users, there are many models and nuances (firmware, battery compartment design etc.). tethertools.ca+1 |
If you like, I can draft product page copy for this item (CRCE18), or compare it against similar dummy battery couplers from other brands so you can see what trade‑offs you’d get.
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