An implant device includes a housing and an energy receiving element disposed in the housing. The energy receiving element is configured to be electrically connected to an energy-consuming device. The implant device is configured to be mounted within a body of a human or non-human animal. The housing includes a feature configured to be accessible through skin of the animal and to receive a corresponding mating member of an external charger including an energy transmitting element. The energy receiving element is configured to receive energy wirelessly from the energy transmitting element when the external charger is mated with the housing.