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01-06-2020, 05:47 AM   #1
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Battery for Pentax 6x7

I recently bought an old Pentax 6x7. I'm still on my first roll of film and last time I used it I accidently left on the power so the battery was empty when trying to take a picture just now. I did it anyway just to see what happens (probably should have waited but too late). When taking a photo the mirror stayed up so I guess I just need a new battery? Some wrote this in another thread which I assume is the right way to deal with this problem:

"When a battery is exhausted and the shutter button is pressed, the mirror will rise only half way. At this point, remove the battery and replace with a new one. Then reset the camera by using a toothpick inserted into the recessed button to othe left of the mirror box: press once, then press the shutter and wind on. This is the only correct method to reset the mirror."

I found a couple of 6v batteries online here in Denmark. The measurements they specify look more or less the same as the one in the camera, but just to be sure I posted them below. Are they both the right ones?

4LR44 Camelion 6V Alkaline Plus

GP Batteries GP476A Special-batterier 476 A Alkali-mangan 6 V 105 mAh 1 stk | Conradelektronik.dk

01-06-2020, 06:17 AM   #2
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Yes. 4LR44 or equivalent (476A in this case) is the correct one. Or 4SR44 if you're going for silver oxide, which keeps a more stable voltage, doesn't corrode and lasts longer, but also way more expensive.
Never leave a battery inside a camera. That can lead to corrosion and a dead camera.
01-06-2020, 09:28 AM   #3
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I used a "PX28" battery in my old 67 body. Hope this helps.
01-06-2020, 09:48 AM   #4
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Thanks, it helps a lot. Didn't know that I shouldn't keep the battery in the camera when not using it. I'll remember that.

01-06-2020, 10:14 AM - 1 Like   #5
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If the battery ever dies on the road and you cant find a replacement, stack 4 MS76 batteries and wrap transparent tape around them. That's what a px28 has inside. I've used it in a pinch in the 6×7s.

Thanks,
barondla
01-06-2020, 10:23 AM   #6
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I use this battery for my P6x7/67 and they are silver oxide:

Varta PX28 4G13 544 4SR44 6.2 volt Silver Oxide Battery | Freestyle Photographic Supplies

Phil.
01-06-2020, 02:00 PM - 1 Like   #7
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QuoteOriginally posted by barondla Quote
If the battery ever dies on the road and you cant find a replacement, stack 4 MS76 batteries and wrap transparent tape around them. That's what a px28 has inside. I've used it in a pinch in the 6×7s.

Thanks,
barondla
That's good to know, thanks!


QuoteOriginally posted by gofour3 Quote
I use this battery for my P6x7/67 and they are silver oxide:

Varta PX28 4G13 544 4SR44 6.2 volt Silver Oxide Battery | Freestyle Photographic Supplies

Phil.
Does it affect the metering when you use a 6,2v instead of a 6v battery?
01-06-2020, 02:01 PM - 1 Like   #8
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The battery..!?
I forgot about that. Haven't seen or changed mine in the P67 for years and years...
PS: If the camera is the MLU version, tape over the MLU nib before stowing in the pack; there is nothing more infuriating than fetching the camera only to find that somewhere along the way it has bumped itself and conveniently flattened the battery. I do carry a spare (possibly two).

01-06-2020, 03:39 PM   #9
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QuoteOriginally posted by Xero Eddie Quote
Does it affect the metering when you use a 6,2v instead of a 6v battery?
I don't think that a 6.2 volt battery will affect exposure vs the 6v. The reason is, that if there was a voltage drop during battery use, your exposure would change. This doesn't happen, so a slight voltage variation is not an issue.
01-06-2020, 06:00 PM   #10
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QuoteOriginally posted by gofour3 Quote
I use this battery for my P6x7/67 and they are silver oxide:

Varta PX28 4G13 544 4SR44 6.2 volt Silver Oxide Battery | Freestyle Photographic Supplies

Phil.
Interesting. There are no 6v silver oxide batteries in Australia. They are all alkaline, and the two spares I have are alkaline, so it is assumed the extra-extra-long lasting 6v battery in Pentaximus, I is alkaline too.
01-07-2020, 08:03 AM - 1 Like   #11
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QuoteOriginally posted by Silent Street Quote
The battery..!?
I forgot about that. Haven't seen or changed mine in the P67 for years and years...
PS: If the camera is the MLU version, tape over the MLU nib before stowing in the pack; there is nothing more infuriating than fetching the camera only to find that somewhere along the way it has bumped itself and conveniently flattened the battery. I do carry a spare (possibly two).
It's not the MLU version. I got a couple of the batteries and did a reset. The mirror went down so everything is okay again. I'm looking forward to see the first test roll developed. :-)
01-07-2020, 10:42 AM   #12
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QuoteOriginally posted by Xero Eddie Quote
Does it affect the metering when you use a 6,2v instead of a 6v battery?
QuoteOriginally posted by desertscape Quote
I don't think that a 6.2 volt battery will affect exposure vs the 6v. The reason is, that if there was a voltage drop during battery use, your exposure would change. This doesn't happen, so a slight voltage variation is not an issue.
QuoteOriginally posted by Silent Street Quote
Interesting. There are no 6v silver oxide batteries in Australia. They are all alkaline, and the two spares I have are alkaline, so it is assumed the extra-extra-long lasting 6v battery in Pentaximus, I is alkaline too.
I use the Varta batteries in my 6x7/67 which do not have a metered prism, I use a hand held meter for these cameras. I only use the AE meter in my 67ii, which uses a different type of battery.

The Varta PX-28 silver oxide is available locally in Vancouver and does last quite a long time.

Phil.
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