H-2D to 2xLR44 Battery Adapter
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This model allows the use of 2 LR44 / PR44 batteries instead of an H-2D mercury battery.
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- Creative Commons — Attribution — Noncommercial
I have a Viceroy Super8 camera that uses a 2.6V mercury H-2D battery to power the lightmeter. These are no longer sold, and while looking online for a suitable replacement I found an adapter to use 2 LR44 batteries in the place of this H-2D battery. Not wanting to pay $49+shipping for a small piece of plastic I set out to make one myself.
I used an M3 hex nut and 2 small beads of solder to create a conductor on the positive side of the adapter. I placed the nut using my soldering iron.
Note that this adapter setup provides 3V, not 2.6V as specified by the original battery. At the moment, I'm unsure if the device will regulate this voltage or not. I expect not, and that I will get some overexposed film, but at least I'm not spending the extra money.
UPDATE: Some more searching turned up an adapter from polar bear camera (https://polarbearcamera.com/products/px14-adapter) that uses PR44 or P675 Zinc 1.45V batteries, which apparently stabilize to 2.7V for the two in series and behave similarly to mercury batteries over use. These batteries would be a more suitable option and should fit in this adapter as well, but may be more difficult to find than LR44s.