Method for operating a traction battery in a motor vehicle, wherein the traction battery is charged in a charging operating state with a fast-charging device, comprising the following steps: - specifying an amount of energy that is to be recharged at the fast-charging device, - determining an anticipated heating of the traction battery depending on a charging power, which is determined taking into consideration a predetermined maximum charging time from the amount of energy that is to be recharged, - determining a battery charging start temperature (T start) in such a way that after carrying out the charging operation at the fast-charging device, a battery operating temperature (T batt) of the traction battery does not exceed a battery operating temperature upper limit (T hi), - determining the battery operating temperature (T batt) in a driving operation state of the motor vehicle, and - if the determined battery operating temperature (T batt) is higher than the battery charging start temperature (T start): reducing the battery operating temperature (T batt) to the battery charging start temperature (T start) in the driving operation state, characterised by: - determining the position of the fast-charging device depending on the position of the motor vehicle and depending on an available remaining range of the motor vehicle, by means of an in-vehicle navigation device, and - querying status information of the fast-charging device via a mobile network and/or reserving a charging time time window on the fast-charging device, wherein the status information of the fast-charging device represents at least an availability and/or a compatibility of the fast-charging device with the motor vehicle. comprising the following steps: - specifying an amount of energy that is to be recharged at the fast-charging device, - determining an anticipated heating of the traction battery depending on a charging power, which is determined taking into consideration a predetermined maximum charging time from the amount of energy that is to be recharged, - determining a battery charging start temperature (T start) in such a way that after carrying out the charging operation at the fast-charging device, a battery operating temperature (T batt) of the traction battery does not exceed a battery operating temperature upper limit (T hi), - determining the battery operating temperature (T batt) in a driving operation state of the motor vehicle, and - if the determined battery operating temperature (T batt) is higher than the battery charging start temperature (T start): reducing the battery operating temperature (T batt) to the battery charging start temperature (T start) in the driving operation state, - specifying an amount of energy that is to be recharged at the fast-charging device, - determining an anticipated heating of the traction battery depending on a charging power, which is determined taking into consideration a predetermined maximum charging time from the amount of energy that is to be recharged, - determining a battery charging start temperature (T start) in such a way that after carrying out the charging operation at the fast-charging device, a battery operating temperature (T batt) of the traction battery does not exceed a battery operating temperature upper limit (T hi), - determining the battery operating temperature (T batt) in a driving operation state of the motor vehicle, and - if the determined battery operating temperature (T batt) is higher than the battery charging start temperature (T start): reducing the battery operating temperature (T batt) to the battery charging start temperature (T start) in the driving operation state, characterised by: - determining the position of the fast-charging device depending on the position of the motor vehicle and depending on an available remaining range of the motor vehicle, by means of an in-vehicle navigation device, and - querying status information of the fast-charging device via a mobile network and/or reserving a charging time time window on the fast-charging device, wherein the status information of the fast-charging device represents at least an availability and/or a compatibility of the fast-charging device with the motor vehicle. - determining the position of the fast-charging device depending on the position of the motor vehicle and depending on an available remaining range of the motor vehicle, by means of an in-vehicle navigation device, and - querying status information of the fast-charging device via a mobile network and/or reserving a charging time time window on the fast-charging device, wherein the status information of the fast-charging device represents at least an availability and/or a compatibility of the fast-charging device with the motor vehicle.