Battery Pack for the Pentax 67

This pack came with a kit of Pentax gear some summers ago.  I finally put it to use last year at Calstar 2013.

Nightfly asked to see it in more detail and so here are the pictures:

The T-shaped device is the Pentax branded plate that allows the power cord to exit from the battery compartment.  This was important when using the camera on a dovetail where the whole camera base was flat against a metal plate.