Close up view of the back side of the battery compartment that also supports the internal PCB

Power from the batteries is passed to the PCB via metal tabs

Tab on the enclosure interfaces to the slide switch on the PCB to cut power when the bottom of the enclosure is rotated to access the batteries

Battery Mating Connectors for the battery compartment metal tabs . The non-forced connectors allow for easy removal of the PCB from the enclosure