3.14 maximum working voltage highest value of a.c. voltage (rms) or of d.c. voltage which may occur in an electric system under any normal operating conditions according to the supplier's specifications, disregarding transients 3.15 overcurrent protection protection intended to operate when the current is in excess of a predetermined value 3.16 rated capacity supplier's specification of the total number of ampere hours that can be withdrawn from a fully charged battery pack or system for a specified set of test conditions such as discharge rate, temperature and discharge cut-off voltage 3.17 room temperature RT temperature of (25 ± 2) °C 3.18 sign of battery current discharge current is specified as positive and the charge current as negative 3.19 specific energy amount of stored energy related to the battery pack (3.2) or system (3.3) mass Note 1 to entry: The mass of battery pack or system includes the mass of the temperature conditioning system if any up to the point of a reversible attachment of the coolant lines or air ducts and thw coolant mass.Note 2 to entry: specific energy is expressed in watt hours per kilogram (Wh/kg).