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With the included rubber O-ring, those Type 675 hearing aid batteries perfectly fit inside the battery chamber of a Canon F-1 classic. This makes them a perfect replacement for the old PX625 mercury batteries that are no longer available.
The batteries that are included are based on Zink-Air and don't distort the measurement of the light meter, since they offer a constant ~ 1.4 V current until complete discharge.
![](https://i.ytimg.com/vi/r_VtexQNuKM/maxresdefault.jpg)