Smart charging systems can prevent problems with the integration of battery electric vehicles (BEV) and allow the user to optimize the charging process according to his preferences. To do this, however, the user must enter his flexibility into the smart charging system. We propose that this flexibility can be increased by the means of choice architecture and digital nudging. Setting defaults and presenta-tion of normative defaults can successfully encourage end users to conserve electric energy. We pro-pose an online experiment to investigate the transferability of these nudges to the provision of charg-ing flexibility.