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BATTERY — Two or more cells connected together.

CELL — An electrochemical system that converts chemical energy into electrical energy.

PRIMARY CELL — An electrochemical device that is discharged only once and then discarded. Alkaline batteries are an example.

SECONDARY CELL — An electrochemical device that may be discharged and recharged a number of times. NiCad batteries are an example.

BATTERY CAPACITY — The ampere-hours available from battery.

BATTERY FLOAT VOLTAGE — A constant voltage applied to a battery to maintain the battery capacity.