A method for operating an electrical energy store system including at least two electrical energy store units. The method includes: a) ascertaining voltages of the at least two electrical energy store units; b) ascertaining at least one first characteristic value of the ascertained voltages; c) ascertaining a charge voltage limiting value and/or a discharge voltage limiting value as a function of the ascertained at least one characteristic value; and d) operating the electrical energy store system as a function of the ascertained charge voltage limiting value and/or discharge voltage limiting value.