5.1.2 Accuracy of measurement equipment and measured values The accuracy of external measurement equipment shall be at least within the following tolerances: — voltage ±0,5 % — current ±0,5 % — temperature ±1 K The overall accuracy of externally controlled or measured values, relative to the specified or actual values, shall be at least within the following tolerances: — voltage ±1 % — current ±1 % — temperature ±2 K — time ±0,1 % — mass ±0,1 % — dimensions ±0,1 % All values (time, temperature, current and voltage) shall be noted at least every 5 % of the estimated discharge and charge time, except if it is noted otherwise in the individual test procedure.