Power your camera continually, and without interruption, with the Case
Relay Camera Power System from Tether Tools. Equipped with a built-in
7.4V, 1,200mAh lithium battery and a 5 VDC input via USB, this system
will provide power, while being connected to an external power source
for a nearly constant source. When connected to a 2A USB battery pack
or an AC adapter, the Case Relay can still be able to provide a
constant supply of power to your camera, and thanks to the internal
battery the system will support hot swapping of external power sources.
An LED indicator light will shift from green to yellow to red to show
battery percentage so that you will not accidentally lose power during
a long time lapse or video production. This system is compatible with
numerous camera systems through the use of a separately available
coupler. This coupler fits into the battery compartment of your camera
and acts as a dummy battery to supply power.