These are particularly large "dry cell" batteries with similar electrochemistry to AA type batteries. Just much larger - see the dimensions. They were often used to power door bell cicuits or the glowing heater filaments for the valves in vintage radios.
Prop ID: 7915
Width: 6.5 cm
Height: 15 cm
Depth: 6.5 cm
Age: 1930s-1960s
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