The Flash Centre

Tether Tools Relay Camera Coupler Canon Batteries (Select Variant)

Tether Tools Relay Camera Coupler Canon Batteries (Select Variant) - Main image
$18.29 $34.99 In stock

Category: Cables, Timers & Remotes

Infinite Power for Your Camera

The Relay Camera Coupler combined with the Case Relay Camera Power System provides constant, uninterruptable power for your camera and is perfect for time-lapse photography, photo booths, video production and power-hungry LiveView shooting or any long day on the set. Need more power? Hot swap in another power bank and continue shooting while never losing power to your camera.

How Does it Work?

Simply insert the Relay Camera Coupler directly into the camera battery port, attach it to the Case Relay CPS and power your camera with the included Rock Solid External Battery Pack or an AC power source using an USB to AC wall adapter or use the ONsite D-Tap Battery with V-Mount. Because Case Relay also has its own secondary internal 1200 mAh battery, if your external battery runs low you can easily hot swap the external battery and not lose power to the camera.


  • Insert Relay Camera Coupler into camera battery cavity
  • Completely close battery door allowing coupler cable to exit through the rubber trapdoor
  • Battery door must be completely closed for the Case Relay Camera Power System to properly function

Relay Camera Coupler & Relay CPS Benefits

  • More cost effective than purchasing multiple proprietary camera batteries
  • Power sources are non-proprietary. Power your camera with the same 5V battery you use to charge phones or tablets.
  • Never need to charge camera batteries again. And never run out power.
  • Compatible with most Canon, Nikon, Sony, Panasonic, Fujifilm, and Olympus cameras. Check to confirm your camera model is supported.
  • A Case Relay Camera Power System (sold separately) is required to use the Relay Camera Coupler.
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Customer Reviews (5.0 / 5 · 5 reviews)

Lily ★★★★★

Finally, no more running out of juice mid-capture—this coupler keeps my camera powered through hours of time-lapse without a hiccup. The connection feels solid and secure, exactly what you need for unattended shoots.

Alexander U. ★★★★★

After months of battery swaps ruining timelapses, this coupler finally lets me run overnight shoots without babysitting the camera. The constant power feed through the dummy battery is rock solid, and I can just plug it into my existing power bank setup.

Timothy ★★★★★

Finally got the Relay coupler and the constant power is a game changer, I can leave my camera cranked through a multi-day shoot without touching the battery once. The fit into the battery compartment is snug and the cable routing feels secure, no wiggling mid-take.