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These requirements cover secondary (rechargeable) batteries for use as power sources in products. These batteries consist of either a single electrochemical cell or two or more cells connected in series, parallel, or both, that convert chemical energy into electrical energy by chemical reaction. These requirements are intended to reduce the risk of fire or explosion when batteries are used in a product. The proper use of these batteries in a particular application is dependent on their use in a complete product that complies with the requirements applicable to such a product. These requirements are intended to cover batteries for general use. These requirements do not apply to batteries designed for use in a product where the combination of the battery and the product are covered by requirements in the product standard, such as the Standard for Portable Electric Tools, UL 745.