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Olympus 35 SP battery replacement
Old 11-21-2010   #1
beetcleaner is offline
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Olympus 35 SP battery replacement


Just got a mint Olympus 35 SP on the net and having it CLA'd. As far as the meter goes does the MR9 adapter with silver oxide 386 cell do what it is supposed to and exactly replicate the voltage of the old PX625 mercury battery? Will I have to get the meter recalibrated? thanks

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Old 11-21-2010   #2
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I use an MR9 adapter with my cameras, and it has a built in resister which steps down the voltage to 1.3 volts. Even if you get stuck using a 1.5 volt battery, you can usually compensate for the extra voltage by adjusting your ASA setting.

I will try out one of my SP cameras with both batteries and see if/how much difference there is between the two.
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Old 11-24-2010   #3
David Hughes
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And the Wein cells are 1.35v and seem perfect as a middle price replacement for the old mercury ones. I use them in several cameras including the Leica CL.

Regards, David
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Old 11-24-2010   #4
John Hermanson
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The 386 battery is 1.55v silver oxide. The diode in the MR9 drops the battery voltage to the correct level. John
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My Canon GIII happily munching on Wein Cells....
Old 11-24-2010   #5
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My Canon GIII happily munching on Wein Cells....

As did my Oly 35SP.... I think the number is Wein Cell MRB626, readily available on eBay at about $5 per. You get a twofer pack at this link:


When I know the camera is going to be sitting for a while, I pull the battery out and tape the air holes shut to prolong the battery life.

Correct voltage and flat voltage curve for the life of about 6-9 months.

I always have 2-3 in the drawer. Been using these for many years in my "used to use mercury 625 @1.35V" situations.

My GIII sitting right next to my monitor as I type this, with a big smile.

Last edited by kuzano : 11-24-2010 at 07:57.
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Old 09-14-2016   #6
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If it can help others:

There is also Frans de Gruijter adapter, very well made by hand.
I recently bought one for my Pen-FT (September 2016)
If he has no stock left he will make some in a couple of days and ship it very fast,
and it has a 5 years warranty.
You then use a current, easy to find, long lasting EPX76 silver-oxide battery,
which, as the original PX625, have a steady discharge curve.

A must-read about PX625 mercury battery replacement:
It includes Frans article, which is also a must read.
His email can be found within the article PDF.
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Old 03-26-2017   #7
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I just grabbed one for $10 but there is fungus in the lens. Where are you guys getting the 35sp CLA done?
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Old 04-15-2017   #8
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Originally Posted by Ccoppola82 View Post
I just grabbed one for $10 but there is fungus in the lens. Where are you guys getting the 35sp CLA done?
$10 is a steal, nice one. I'd like to know this too, although I live in the UK. I recently emailed this guy who's known to be the go-to for Olympus repairs I believe: http://www.zuiko.com/web_5__20150924_009.htm he recently started repairing Olympus 35 SP cameras again, although as you can see it will cost at least $119.

I managed to clean the fungus out of my SPN lens myself, so if that's all that's wrong with it I'd recommend a DIY job. If you need help doing this just give me a shout, all it involves is dismantling the lens from the front (unless the fungus is on the back element in which case an entire strip down is needed).

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