Abstract: A user interface for a power transfer device configured to wirelessly transfer transcutaneous power to an implantable medical device. The user interface may enable a user to start and stop power transfer, e.g., to recharge a battery? on the implantable medical device. In some examples, the user interface may present the user a display that indicates whether the power transfer device is performing open or closed loop recharging, indicate and control therapy delivery? status of the implantable medical device and indicate both die power transfer device battery? level and/or indicate the battery level for the implantable medical device, lire user interface may communicate with the user with a set of indicator lights that may flash, pulse and change color as needed.