ISO 12819:2009规定了两种确定电池驱动手表电池寿命的方法，并规定了制造商或分销商用于通知用户的标签。 根据可用信息，必须使用ISO 12819:2009中给出的方程式计算理论电池寿命或实际电池寿命。

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.