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Dry cells use a damp paste electrolyte in a sealed housing so the electrolyte can not spill or leak from the cell and damage the equipment it powers. Wet cells use a liquid electrolyte that can spill and/or leak from the cell and severely damage the equipment it powers.

Almost all early battery cells were wet cells with the electrolyte contained in either a glass beaker or glazed pottery crock. The user had to periodically add water to keep them from drying out and being damaged, also he had to be careful not to spill or crack the cell. Almost all modern cells are dry cells because they don't spill or leak and require no user maintenance. The main wet cell still used is the lead-acid battery used in car batteries (and some of these have the acid gelled to keep it from spilling or leaking).

Dry cells have generally replaced wet cells because they are more practical.

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