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05-05-2011, 07:37 AM   #1
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Battery help - Pentax SP500

I need a replacement battery does anyone know what current battery is available to replace the 1.3V mercury PX-400.


05-05-2011, 07:51 AM   #2
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Asahi Pentax Spotmatic SP500 -'s Classic Camera DB
Availability of batteries for the Spotmatic is better than other cameras of the era because the Asahi engineers built in a bridge circuit in the metering which makes it battery voltage independent. This means you can use the original 1.35 mercury PX400 battery, or a 1.5V silver-oxide replacement without problems. An exact fit PX400S is available, or you can use a #392 cell with a small rubber-O ring (purchasable at any fine home repair center or DIY store) as a spacer. I believe a #397 also fits as well.
Camera Batteries - a complete chart -'s Classic Camera DB
1) The 1.55v silver oxide Energizer E387S is an exact fit. This is also sold as the Radio Shack 387S (RSU #11608452), but is a special RSU order. has the S400PX as a replacement.

2) Both of the above are 1.55v silver oxide. They work with the Spotmatic which has voltage regulating bridge circuitry, but other older cameras may be more problematic.

3) CRIS H-B Adaptor and silver 377 batteries. The CRIS adaptor has a diode to take it down to the proper voltage, although the Spotmatic doesn't need the lower voltage.

4) Wein zinc-air cell have a stable voltage over their life and are thus suited to many older cameras. The disadvantage is that these only last a few months. Sources for Wein cells noted below.

I bought a bunch of Excell PX400S batteries via ebay a few years ago and they work well, though a couple ended up leaking in their package before I got around to needing them... so I guess I'm saying you don't need to accumulate a large store of them.

I'm thinking I'll go with the Energizer E387S next time - you can get these from many sources, e.g. Amazon, where 1 goes for $4.20 and 5 for $17.99
05-16-2011, 02:41 PM   #3
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I got the same one and was happy with it
05-16-2011, 05:40 PM   #4
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As above, the bridge circuit means that any 1.5v that fits, works.
Pentax was very wise to use a bridge circuit.

05-16-2011, 11:01 PM   #5
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Is the Energizer 387S still being made?......I know there's a bit of stock around...but how old is it?
Cheers, Pickles.
05-29-2011, 11:37 PM   #6
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I have had success with the #395 watch battery. I found it is best to use fingernail polish around the raised area inside the battery cap to avoid a short that kills the battery.
06-01-2011, 05:18 AM   #7
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I've had success with basic small 1.5volt button cells in my SP1000. Again bridge circuit to the rescue on these cameras. Good luck!

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