The trouble with mercury batteries (and what to do) – - Daniel J. Schneider
Different Spotmatics with different battery covers require different batteries? - PentaxForums.com
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Spotmatic Battery Question. - PentaxForums.com
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Pentax Spotmatic / Spotmatic F / Pentax SP
Different Spotmatics with different battery covers require different batteries? - PentaxForums.com
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