A method for detecting acid stratification in a battery includes the following steps: determining a first state of charge value during a load period of the battery on the basis of an estimated open-circuit voltage, determining a second state of charge value during a rest period of the battery following the load period on the basis of a measured open-circuit voltage, comparing the first state of charge value to the second state of charge value, and detecting acid stratification when a defined deviation of the first state of charge value from the second state of charge value is exceeded.