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.