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The Case Relay External Power System (EPS) lets you power your 

camera continually with an external battery pack, providing peace 

of mind knowing you have an uninterrupted power source for your 

camera. 

If you’re shooting and power gets low on the primary external battery 

power bank, simply swap out the power bank. Your camera will not 

turn off. Power will continue to flow to your camera with the Case 

Relay EPS internal 1200mAh battery. Utilizing a wall outlet or external 

power banks, you could theoretically shoot forever with uninterrupted 

consistent power.

USAGE STEPS
Step 1:
 Find the correct Relay Camera Coupler for your specific 

camera at www.TetherTools.com/Relay then click on the Shop by 

Camera section to find the compatible coupler. 
Step 2: Plug the Case Relay EPS into the Relay Camera Coupler (sold 

separately).

Step 3: Plug the Case Relay EPS USB port into an external power 

bank or wall charger. Note: 5V, 2A external power bank or 2.4A USB 

wall charger is required to power Case Relay EPS.

Step 4: Insert the Relay Camera Coupler into your camera.
Step 5: Turn on your camera, and enjoy the peace of mind knowing 

you have an uninterrupted power source for your camera.

Step 6: Monitor your primary external power bank throughout the 

shoot. The Case Relay EPS battery will show a Red indicator light 

when power is low. Swap out external power banks as needed.

Note: Case Relay EPS secondary internal 1200mAh battery is as large 

as many regular camera batteries and can support shooting and all 

camera features while swapping out primary external battery banks. 

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