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Near Field Communication (NFC) in mobile devices like smart phones shows potential for applications like payment, identification, etc. Unfortunately the needed functionality increases the battery drain of the device. As a countermeasure power-management techniques are implemented. However, these techniques commonly don't control the power transfer to the tag to prevent wasting energy. To adapt this transfer during run-time the properties of the reader, tag and the physical relation between them are needed. This paper proposes a method called PTF-Determinator. It determines the Power Transfer Function (PTF) during run-time and scales the provided power transfer accordingly to save energy. As a case study the PTF-Determinator is integrated into the tag-detection algorithm. Investigations are made regarding the power consumptions and timings through simulation and measurement on a development platform for mobile phones. The results show that 12% of the energy can be saved on average.