ISO 12819:2009 Preview
Methods of evaluation of the battery life of a battery-powered watch
This standard was last reviewed and confirmed* in 2014.
*Therefore this version remains current
ISO 12819:2009 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 must be calculated using the equations given in ISO 12819:2009.