NOVELTY - The electro-mechanical battery comprises a support member, a first flywheel having a first rotating frame (10), a second flywheel having a second rotating frame, where the first and second rotating frames are supported by the support member and configured to rotate about an axis, a battery (6) supported by the first rotating frame, a mechanical coupling system configured to store rotational kinetic energy in the first rotating frame and to facilitate retrieval of the rotational kinetic energy, a rotating electrical connection between the support member and the battery, and a housing.    USE - The electro-mechanical battery is useful as power storage devices in vehicles such as electric, hybrid electric or solar powered vehicles.    ADVANTAGE - The electro-mechanical battery reduces harmful emissions from the vehicles thus reducing greenhouse gas emissions, minimizes the gyro effects, improves the stability of a vehicle on the road, reduces drag forces, can withstand centrifugal and/or hoop forces, enables electric energy storage at optimal times and cost, and can be economically manufactured with high energy capacity, light-weight, high lifespan and reduced size.    DETAILED DESCRIPTION - The electro-mechanical battery comprises a support member, a first flywheel having a first rotating frame (10), a second flywheel having a second rotating frame, where the first and second rotating frames are supported by the support member and configured to rotate about an axis, a battery (6) supported by the first rotating frame, a mechanical coupling system configured to store rotational kinetic energy in the first rotating frame and to facilitate retrieval of the rotational kinetic energy, a rotating electrical connection between the support member and the battery, and a housing configured to keep the first rotating frame and the battery or the flywheel in a vacuum or a partial vacuum. The rotating electrical connection is configured to permit charging and discharging of the battery while the first rotating frame is rotating. The rotating electrical connection comprises a mercury revolving contact. The first rotating frame is configured to rotate in a first direction and the second rotating frame is configured to rotate in a second direction that is opposite to the first direction. The first rotating frame is supported by the support member by a magnetic bearing or a high-temperature superconductor bearing. The support member is supported by a gimbal. A total mass of the first rotating frame or the fly wheel and the battery is 100 kilograms. The first rotating frame is designed to rotate 20000 RPM. The flywheel is configured to store rotational kinetic energy in the first rotating frame and to facilitate retrieval of the rotational kinetic energy. The first rotating frame has a receptacle. The battery is disposed within the receptacle. An INDEPENDENT CLAIM is included for a vehicle.    DESCRIPTION OF DRAWING(S) - The diagram shows a side view of a wheel unit of an electromechanical battery.    Axle (2)    Battery (6)    Spoke (7)    First rotating frame (10)    Wheel units. (11)