A method is described for monitoring a charging process of a battery, in which cell voltages of a plurality of battery cells are measured at regular time intervals, and loading of the battery by a process of switching on an additional electrical load is prevented if the measured cell voltage of one battery cell exceeds a predetermined cell voltage threshold value. A motor vehicle is also described, which is configured to carry out the method according to the disclosure during a battery charging process. In addition, a battery system is described, in which a controller is configured to determine an estimated value as a function of measured battery parameters during a charging process of the battery. The estimated value corresponds to the maximum temperature in the battery if the charging process is continued without interruption.