I understand the M5 meter will not switch off if the camera is cocked. My shooting habit is to advance the film for the next shot. The meter would stay on if I did not change my habits. The older Pentax cameras also work like this. Can one just cover the lens and therefore reduce the battery drain to near zero? Is one technique to fire off the frame with the lens cap on and use the double exposure procedure to not waste the frame? Any other thoughts from M5 shooters on how to deal with the meter besides not using it in favor of a incident meter?