A method for operating a charging connection device for electric vehicles, which charging connection device has an energy measuring device structurally integrated into the charging connection device, which energy measuring device is configured for measuring and counting the electrical energy drawn during charging processes of electric vehicles, comprising the steps of: - storing a final valid energy meter end value (Xn) of the energy measuring device in a data-protected energy data storage device in the charging connection device, in particular within the energy measuring device, in a time window after completion of a charging process (LVn-1) and before the start of a further, subsequent charging process (LVn); - detecting an intended charging process (LVn) for drawing electrical energy at the charging connection device; - storing a business case data packet (G-DPn) in the charging connection device, comprising at least one piece of the information including a charging process identifier, a user identifier, a vehicle identifier, a date, a time, a charging connection device identifier and an energy measuring device identifier; - executing the charging process (LVn) and measuring and counting the energy consumption during the charging process (LVn) by means of the energy measuring device up to a charging process end time (LVe); - detecting an energy meter sum value (Xn+1) of the energy measuring device at the charging process end time (LVe); - generating a combined charging process data packet (LV-DPn) comprising at least one piece of the information from said business case data packet (G-DPn) (i) combined with the energy meter end value (Xn) and the energy meter sum value (Xn+1) or (ii) combined with a difference value of the energy meter sum value (Xn+1) and the energy meter end value (Xn); - digitally signing and transmitting at least this combined charging process data packet (LV-DPn) after completion of the charging process (LVn) to a central management system, in particular to a billing center, wherein the step of creating a combined charging process data packet (LV-DPn) comprises merging a plurality of charging process data packets (LV-DP) from a plurality of charging processes into a cumulative charging process data packet (LV-DPk), and the step of signing comprises applying a hash function over this cumulative charging process data packet (LV-DPk). - storing a final valid energy meter end value (Xn) of the energy measuring device in a data-protected energy data storage device in the charging connection device, in particular within the energy measuring device, in a time window after completion of a charging process (LVn-1) and before the start of a further, subsequent charging process (LVn); - detecting an intended charging process (LVn) for drawing electrical energy at the charging connection device; - storing a business case data packet (G-DPn) in the charging connection device, comprising at least one piece of the information including a charging process identifier, a user identifier, a vehicle identifier, a date, a time, a charging connection device identifier and an energy measuring device identifier; - executing the charging process (LVn) and measuring and counting the energy consumption during the charging process (LVn) by means of the energy measuring device up to a charging process end time (LVe); - detecting an energy meter sum value (Xn+1) of the energy measuring device at the charging process end time (LVe); - generating a combined charging process data packet (LV-DPn) comprising at least one piece of the information from said business case data packet (G-DPn) (i) combined with the energy meter end value (Xn) and the energy meter sum value (Xn+1) or (ii) combined with a difference value of the energy meter sum value (Xn+1) and the energy meter end value (Xn); - digitally signing and transmitting at least this combined charging process data packet (LV-DPn) after completion of the charging process (LVn) to a central management system, in particular to a billing center,