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What is a Secondary Cell
Secondary Cells are electrochemical cells, whose electrochemical reactions are reversible

During charging, the positive active material is oxidized, producing electrons, and the negative
material is reduced, consuming electrons. These electrons constitute the current flow in the external circuit. The electrolyte may serve as a simple buffer for ion flow between the electrodes, as in
lithium-ion and nickel-cadmium cells, or it may be an active participant in the electrochemical
reaction, as in lead-acid cells.

There are various types of rechargeable batteries available.