Gossen Luna-Pro Batteries

digital_photog · Nov 14, 2008

I still use my older Gossen Luna Pro and the batteries are weak. The battery type is Mallory PX 625 or PX 13. My question is are they still available?? If not what type would work in this meter (with or without an adapter.

Thanks

Fred

Thomas Bertilsson · Nov 14, 2008

http://www.bhphotovideo.com/c/product/89868-REG/Gossen_GO_4145_Adapter_Kit_Battery_Holder_for.html

digital_photog · Nov 14, 2008

Thanks for the information!!!

Fred

Pinholemaster · Nov 14, 2008

Dead Link Removed

http://www.smallbattery.company.org.uk/sbc_px625.htm

http://www.tnrbatteries.com/a6alknaspxpx.html

Thomas Bertilsson · Nov 14, 2008

It will allow you to run your meter on standard silver cell batteries, that's the advantage. I've got a Luna Pro myself, and I'm looking at buying one of these kits.

- Thomas

digital_photog said:
Thanks for the information!!!

Fred

Venchka · Nov 14, 2008

Wein cell zinc-air batteries are an exact drop replacement for the original mercury cell PX 625. There are also similar hearing aid batteries. The hearing aid batteries are smaller than the original PX 625, but there are work arounds. GOOGLE knows.

I own a Luna-Pro and 2 M5 bodies. They all take PX 625 batteries. I have used the Wein cells in all three. They work. They last about a year in the Luna-Pro. I found a stash of originals and use those right now. I carry 2 Wein cells in my bag for spares in the field.

$37 buys a lot of zinc-air batteries. It will buy even more hearing aid batteries if you can get them to fit.

Good luck!

Lee L · Nov 14, 2008

Venchka said:
Wein cell zinc-air batteries are an exact drop replacement for the original mercury cell PX 625. There are also similar hearing aid batteries.
$37 buys a lot of zinc-air batteries. It will buy even more hearing aid batteries if you can get them to fit.

Buy one Wein cell for each camera. After it's dead, knock off the washer and re-use it on 675 hearing aid batteries, which you can buy much cheaper and in multi-packs. I use both this method and the CRIS adapter. Dead Link Removed

Lee

Venchka · Nov 14, 2008

Thanks Lee! I saved my dead zinc-air 625s. I wasn't sure what to do. I'll see about getting the washers off this weekend.

I know it's tough typing directions, but can you shed some light on how to "knock off the washer"?

Lee L · Nov 14, 2008

Venchka said:
Thanks Lee! I saved my dead zinc-air 625s. I wasn't sure what to do. I'll see about getting the washers off this weekend.

I know it's tough typing directions, but can you shed some light on how to "knock off the washer"?

The Wein cell is a standard form zinc air battery with a washer that's formed to "press fit" to the battery perimeter. It can be taken off with some light tapping in the direction of the non-printed (negative) face of the battery. Often it comes off by just placing the negative pole down on a table and then pressing down on the washer with your thumbs. If you look closely, you'll see that the battery perimeter tapers down a bit toward the negative pole. Just be careful not to get the washer tilted so much that it bites into the battery edge. A good hand-tight fit will hold the washer in place on a new battery.

Lee

Pinholemaster · Nov 14, 2008

But I hear perfectly fine. Grin.

Lee L · Nov 14, 2008

Pinholemaster said:
But I hear perfectly fine. Grin.

Could you please repeat that? I didn't have my light meter turned up.

Lee

Venchka · Nov 14, 2008

Thanks Lee! I'll try getting them off tomorrow. Then I can give my real PX 625 batteries a rest.

JRieke · Apr 24, 2009

Hate to open up an old thread but since I had this same issue and found my own work around I thought I would post it. I found people on the net saying they had good luck with 675 hearing aid batteries so I picked up two packs from CVS on sale, buy one get one free. Since the diameter of the new batteries was much smaller than the original I simply cut two pieces of heavy paper one about 3/16 of an inch and another that was about 3/8 I rolled the smaller piece tight, dropped it into the compartment then rolled the larger and dropped it inside the first. A little playing with it got a good snug fit. I enlarged the hole on the back of the battery cover to allow better air circulation the followed the instructions from http://www.graphic-fusion.com/lunapro.htm to recalibrate it to the higher voltage.

I hope this helps anyone else looking for a good, cheap, easy way to keep their light meter functioning.

Thanks

Jeremiah

RobertV · Apr 25, 2009

http://www.butkus.org/chinon/batt-adapt-us.pdf

But from Gossen you can order the adapter + 2x Silveroxide 1,55V batteries which makes again 2x 1,35V again.

Mark Layne · Apr 25, 2009

As an interesting aside. The 625 batteries in my Luna Pro were put in in 1973 before I moved to Nova Scotia. They have never leaked and still go to the check mark.
Newer batteries in other equipment are long since dead.
I have been told that the life of these batteries depended on the purity of the raw materials received by the manufacturer.
Mark

budrichard · May 20, 2009

675 hearing aid batteries are 1.4v and should not require calibration.
You can get 8 675 Walgreen's brand for $7.99 and with two #9 rubber o-rings($2) to fit around the 675, you are in business. I just put an older Luna Pro(says Germany(West)) back in service with this method and the meter checks out perfectly.-Dick

Gossen Luna-Pro Batteries

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