US Patent 10479223 Construction and operation of electric or hybrid aircraft

This disclosure describes at least embodiments of a power management system for a vehicle. The vehicle can include a first transducer and a second transducer supported by a housing of the vehicle. The first transducer can be powered by a first battery, and the second transducer can be powered by a second battery different from the first battery. The first transducer and the second transducer can propel the housing, and the second transducer can charge the second battery. Electronic circuitry can cause the first battery to power the first transducer while the second transducer charges the second battery.