sand battery
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English
Noun
sand battery (plural sand batteries)
- (electronics, historical) An unspillable electrochemical battery whose cells use electrolyte soaked sand – typically used to test telegraph cables at sea.
- (military, historical) A sand fort equipped with an artillery battery, frequently found in coastal defense, usually having organic infantry attached.
- (thermodynamics, industrial planning) A thermal storage battery which uses sand as the storage medium.