NOVELTY - The system has a bank of electric batteries for providing power to electric drive motors (80), and a conductor for measuring the charge of each of the batteries in the battery bank. A power controller connects one of the batteries to the electric motors, where the controller disconnects the battery and connects a different one of the batteries to the electric motors as a function of the state charge of the former and the latter batteries. A capacitor bank supplies power to the electric motors during predetermined conditions.    USE - Hybrid power system for a hybrid electric vehicle.    ADVANTAGE - The system does not rely on petroleum based fuels, and includes an electric power source and a non-electric power source forming a hybrid power source that is managed by a power management subsystem to dynamically optimize the driving range of the vehicle. The hybrid power source includes a set of batteries and a bio-diesel engine, to drive the electric motors coupled to vehicle wheels. The bio-diesel or other non-electric energy source is used to drive an electric generator which can be used to recharge the batteries or provide power to the electric motors. The system can utilize compressed air as a non-electric alternative energy source to drive an air motor that is coupled to the electric generator. The electric generator is used to recharge the batteries or provide power to the electric motors. The system powers vehicle accessories such as lights, powered by a separate accessory battery that is recharged by the non-electric power source. The system is configured so that the accessory battery and the drive batteries can be charged from standard 120/240 volt alternating current receptacles, when the vehicle is not in motion.    DESCRIPTION OF DRAWING(S) - The drawing shows a circuit diagram illustrating an operating mode of an adaptive power control circuit.    Storage capacitors (C1, C2)    Diodes (D1-D3)    Field effect transistors (Q1-Q3, Q8-Q11)    Electric drive motors (80)    Adaptive power control circuit (300)