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    What is a "Cell" Versus a "Battery"?

    • A battery is two or more cells electrically connected together by permanent means, 
    including case, terminals and markings.
    Note: “Battery packs,” “modules” or “battery assemblies” are treated as batteries 
    under this regulation.
    • A cell is a single encased electrochemical unit. It has one positive and one negative 
    electrode that exhibit a voltage differential across its two terminals.1
    Note: Many cells can be termed “battery” or “single-cell battery” in common 
    conversation, but under this regulation a single cell must use the requirements related 
    to “cells” only. Examples of a “cell” would be a CR123 primary lithium cell used for 
    cameras and flashlights.

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