Pentax Spotmatic Battery Adapter
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Battery adapter for Pentax Spotmatic that uses 377 batteries.
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(also works with Spotmatic SP, Spotmatic SPII, Spotmatic IIA, SP500, SP1000)
Since the original batteries for the Spotmatic (the mercury 400-PX) are no longer being made, and the hearing aid zinc batteries are expensive, its annoying to find a way to power the light meter in the Spotmatic.
This print is an adapter that uses an 377 Silver Oxide battery that can be commonly purchased.
No modifications to the camera needed! You will only need to source a little 1.8mm spring (can be found inside lighters) to place in the hole to close the circuit (the spring will need to touch the battery itself and the closing lid of the battery compartment).
Post-Printing
Battery opening and spring hole sizing
The print is made to snugly fit the battery straight off the hot bed, but due to printer differences you might need to widen it.
The little hole at the bottom of the print is for a spring to be fitted through it to close the circuit. The spring I used is tiny (1.8mm diameter) and if you dont have one you can widen the hole using a drill to whatever size spring you have at hand.
Battery orientation
The battery positive (+) should face towards the top of the camera. This means that when you flip the camera upside down to insert the battery, the positive (+) side will go down into the battery compartment, face inwards into it.
Failure to insert battery properly will most likely short it.