Souvenirs of Yesteryear: A salt and battery

Batteries produce electricity from chemical interactions. They come in two major types: primary, which produce electricity, and secondary or storage, which have to be charged. Primary batteries themselves come in two types: dry cells and wet cells. Dry cells can be handled without fear of spilling their contents. Wet cells are vats of liquid; they are not widely used anymore. Thus they are interesting pieces of history.

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