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I make an intelligent guess that over 90% of batteries sold on Christmas day are AA, AAA, and PP3 types. On Christmases of the past several other types of battery were in regular use but are now largely obsolete including:
Every Ready No. 8. A cylindrical 3V battery containing two 1.5V cells often called a duplex or bijou battery. Mainly used in torches.
Every Ready 126. A cuboid shaped 4.5V battery with screw terminals. A higher Ah version of the 1289 / 3R12 4.5V battery. Sometimes called a doorbell battery but also used to power train sets and slot cars.
Every Ready No. 800. A 3V battery comprised of two cylindrical 1.5V cells side by side. Used almost exclusively for bike lights.
The PP3 battery is ubiquitous and its big brother the PP9 is always available if you know where to look, although it may be a bit tricky to buy one on Christmas day, but there were once other members in the PP family. The PP6 and PP7 were intermediate in size and energy capacity between the PP3 and PP9. There was also a 6V PP1. The PP8 is a very large 6V battery used mainly for electric fences and was very rarely found in domestic products. The PP4 was a cylindrical 4.5V battery with a snap connector at each end. I have never actually seen one or a device which uses them.
531 / PX19. A cylindrical 4.5V battery with a snap connector at each end that looks like a longer version of a PP4. Used in Polaroid cameras and a few models of industrial controllers.
Mercury oxide batteries. Mostly produced in the form of button or coin cells but battery packs with higher voltages were also available. The output voltage of a mercury cell was very stable at 1.35V until it ran out and it had a higher energy capacity than an alkaline battery of the same size. Production ceased in the 1990s due to environmental reasons.
Do you remember any other batteries from bygone Christmases that we used to love or hate?