as far as I know you don't need a battery, the Vito cla ,which is the next one in the range, has a selinuim meter and the shutter is a pronto slk 500 which is manual,, at least the one I have does not have a battery and the instruction book, from the Butkess site, which covers the csr as well has no mention of a bettery, you need film in the camera to set the shutter as you wind, so you can't try the shutter without film loaded, Like all of the comprehensive Vito range, which started with the Vito folders then Vito b, vitomatics up to the Vito csr and cla always never had a battery and you need a film to use it, If the meter is not working, it happens with these old cameras, then you will need a hand held ot a camera with a working meter, or use the sunny 16 ruke and get out and enjoy a great little camera
Richard