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ISO 12819:1999 Methods of evaluation of the battery life of a battery-powered watch
standard by International Organization for Standardization, 05/01/1999
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This International Standard specifies two methods for determining the battery life of a battery-powered watch and specifies the labelling to be used by the manufacturers or the distributors to inform the users.
According to the available information, either the theoretical battery life or the practical battery life is calculated using the formulae given in this International Standard.