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Required for UL 1642 covering primary (nonrechargeable) and secondary (rechargeable) lithium bat-
teries for use as power sources in products. These batteries contain metallic lithium, or a lithium alloy,
or a lithium ion, and may consist of a single electrochemical cell or two or more cells connected in
series, parallel, or both, that convert chemical energy into electrical energy by an irreversible or revers-
ible chemical reaction.