I have a Rollei 35 S.

I want to use its photometer . As you know there are two orange , one white dial at the top. There is no battery inside and the orange dials are not moving when I move the speed , aperture dials at the front. Is this normal ?
I opened the camera and there is a battery hole inside and empty. How will I attach the battery to this place ? Might there be a cover there ? If yes , Where can I find this cover ?

Thanks ,