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The Chinon CS has an in-built light meter that was designed to be powered by a 1.35 volt PX13 mercury cell providing a constant power source. Due to environmental reasons, mercury batteries are no longer readily available in many countries. Suitable replacements include a 1.5 volt Alkaline battery (together with an adjustment in the camera's film speed setting), a 1.35 volt WeinCell zinc/air battery, or a number of other PX13/PX625 battery substitutes.