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22.5 Battery

 
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geneaker



Joined: 05 Feb 2008
Posts: 5
Location: santa fe, new mexico

PostPosted: Sat Jul 06, 2013 12:16 am    Post subject: 22.5 Battery Reply with quote

I have a great Super Speed---and the electronic release still works!
However, I notice that Eveready has discontinued the 22.5 battery.

I used to get them at Battery Plus--no luck now. Also got them at Mid West Photo---but they stopped, too.
Any suggestons?
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45PSS



Joined: 28 Sep 2001
Posts: 3231
Location: Mid Peninsula, Ca.

PostPosted: Sat Jul 06, 2013 1:24 am    Post subject: Reply with quote

using "google" as my search engine, i don't bing, and eveready 412 as the search key word and selecting eveready 412 22.5 V battery search suggestion the first link is:
http://www.batterycountry.com/ShopSite/specialty-cell.html
and the 3rd link
http://www.batteriesinaflash.com/special-application/eveready-412-carbon-zinc-22-5v-battery-neda-215-15f20-blr122
both appear to have stock available.
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geneaker



Joined: 05 Feb 2008
Posts: 5
Location: santa fe, new mexico

PostPosted: Sat Jul 06, 2013 3:05 am    Post subject: thanks. many thanks. Reply with quote

Hey, I"m back in the game. I like the electronic release more than a cable. Two years ago, I had the Rodenstock 135mm rebuilt--works perfectly!
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Jim23



Joined: 08 Sep 2001
Posts: 128
Location: US/Greater Cincinnati, Ohio

PostPosted: Tue Jul 23, 2013 6:57 pm    Post subject: Experiment, Eveready 412 22.5v Replacement Reply with quote

I may have found a workaround for the 412 battery discontinuance. I fabricated a small plexiglass tray that holds a pair of type N (A23) 12v alkaline batteries (inexpensive!) in series with a pair of silicon diodes (-1.4v drop) to yield 22.6 volts. I checked the voltage and will build a second one to be able to test the Super Graphic. CAUTION - this is untested and requires careful fabrication and soldering skills. Try at your own risk.


http://www.flickr.com/photos/jhtlr/9351125879/


Last edited by Jim23 on Tue Jul 23, 2013 11:43 pm; edited 2 times in total
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45PSS



Joined: 28 Sep 2001
Posts: 3231
Location: Mid Peninsula, Ca.

PostPosted: Tue Jul 23, 2013 7:41 pm    Post subject: Reply with quote

www.graflex.org/helpboard/viewtopic.php?t=5114
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Jim23



Joined: 08 Sep 2001
Posts: 128
Location: US/Greater Cincinnati, Ohio

PostPosted: Thu Jul 25, 2013 8:49 pm    Post subject: Alkaline Equivalent for Discontinued 412 Reply with quote

I found this cell:

http://www.batteriesinaflash.com/special-application/exell-412a-alkaline-22-5v-battery-neda-215-15f20-blr122

At $30 - ouch.... x 2 for the Super/Speed Graphic.

I am still pursuing my adapter that takes a pair of cheap A23 cells.
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Rick from OZ



Joined: 05 Jul 2006
Posts: 37
Location: near Melbourne, Australia

PostPosted: Sun Jul 28, 2013 6:23 am    Post subject: Midwest photo supplies has them on their site at ~$6.87 Reply with quote

Midwest phopto supplies has them on their site at ~$6.87

I can't guarantee stock, and since I'm in Australia, don't have a lot to do with them, but you can but try.

http://mpex.com/super-graphic-batteries-22-5volts.html

Good luck ! Rick
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jpowersphoto



Joined: 04 Jun 2014
Posts: 3
Location: Chico CA

PostPosted: Sun Jun 08, 2014 7:52 pm    Post subject: 22.5 volt Batteries Reply with quote

What about using these batteries (http://www.amazon.com/Alkaline-22-5V-Battery-BLR155-15F15/dp/B008FPCWTO/ref=sr_1_1?ie=UTF8&qid=1402256898&sr=8-1&keywords=22.5+v+battery) in a custom battery compartment that fits inside the camera?
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45PSS



Joined: 28 Sep 2001
Posts: 3231
Location: Mid Peninsula, Ca.

PostPosted: Mon Jun 09, 2014 3:09 am    Post subject: Reply with quote

They will not last very long if they work at all.
The solenoid, which the camera electronics power, is a current dependent device that requires 2 to 3 amps to operate. The solenoid is what trips the shutter.
The Eveready 412 is rated at 140 mAh.
The Exell 412A is rated at 180mAh. 128% of original.
http://www.amazon.com/Exell-Alkaline-22-5V-Battery-BLR122/dp/B00BNF0Y8Y/ref=pd_sim_sbs_misc_1/183-5528891-3399163?ie=UTF8&refRID=0VVD7DRT0ER1Q48MP7CX
The Exell 505 is rated at 60mAh. 42% of original.
1 mAh= 1 milliamp for an hour continuous current draw.
The batteries charge capacitors in the camera RF housing. Once charged the capacitors supply the current necessary to operate the solenoid.
The circuit will try to draw the current it needs to charge the capacitors from the batteries. Putting lower current capacity batteries in the camera will result in slower charge times which equal a longer delay between shutter trip cycles and shorter battery life.
Exceeding the original battery current capacity will give longer battery life and possibly slightly faster trip cycle times.
http://exellbattery.com/
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