1.35V Mercury Battery Replacement

There are a lot of articles out there about what kind of battery you can use instead of the defunct 1.35V PX625.

I have tried the Wein PX625 and I like it, but as every Zinc-Air battery it doesn’t last long, and at roughly $6, that’s a problem. The alternative is to use a Silver oxide battery, but those are expensive too.

The solution I found is to use Zinc-Air 675 hearing-aid batteries, for example from Duracell, with a ring adapter. These batteries run at 1.4-1.45V, which means you will have to calibrate your camera for that voltage, but they are very cheap, around $1 each.

Where to find the perfect ring adapter? Buy a Wein PX625 and when that battery is dead remove the ring and use it on the 675, it fits perfectly.

Wein battery

Wein battery with the ring removed

Wein battery next to the hearing-aid 675 battery, exactly the same size

The 675 battery with the Wein ring