The Primsat PH doesn not require a battery. There was also a later version of this camera called CPH (or CP). It features a CdS meter which is positioned on the front of the camera below the rewind knob and not on the front of the prism. I assume that the CPH requires a battery for the CdS meter.
Mamiya only offered three different lenses for the Primsat PH and CPH. They have a special bayonet mount and are called Mamiya-Sekor F.C. (see table below).