An epicyclic transmission gear and disk brake based regenerative braking device with regenerative braking and energy storage features, said epicyclic gear based regenerative braking device comprising: an extended hub connectable to a conventional hub of a rear wheel of the vehicle through a plurality of connectors, characterised by the extended hub having a first needle bush bearing positioned on outer surface thereof; a disc brake clamp unit having a brake disc, the brake disc coaxially mounted on the extended hub, the disc brake clamp unit configured to arrest rotation of the brake disc, the disc brake clamp unit connecting to a hand brake lever of a hand brake; an epicyclic transmission unit having a planet gear band, a sun gear, a ring gear and a plurality of planetary gears, the planet gear band positioned on the needle bush bearing, the planet gear band having a plurality of arms that receive a planetary gear shaft through respective openings thereof, each planetary gear shaft having a second needle bush bearing positioned thereon, each second needle bush bearing respectively receiving the planetary gear thereon, the sun gear positioning on the extended hub, the sun gear meshing with the plurality of planetary gears, the ring gear configured to receive momentum through the planetary gears in a direction reverse to rotation of the sun gear on arrested motion of the planet gear band, the planet gear band connecting to the brake disk of the disk brake unit to transfer momentum to the ring gear; a clock spring torque storage module having an inner casing ring band, a one way clutch bearing, an inner casing, a booster/ clock spring and an outer casing, the one way clutch bearing positioned on the extended hub, the one way clutch bearing receiving the inner casing thereon, the inner casing configured to receive momentum transfer from the ring gear, the outer casing having a sinusoidal contoured surface, the clock spring configured to be coiled during rotation of the inner casing in a direction opposite to rotation of rear wheel; and a strip chassis unit bolted on a shaft of the conventional hub, the strip chassis unit having a spring calibrated restraint wheel loaded with a calibration screw and a spring, the spring calibrated restraint wheel configured to engage with the sinusoidal contoured surface of the outer casing to arrest the outer casing from spinning below a predetermined torque. an extended hub connectable to a conventional hub of a rear wheel of the vehicle through a plurality of connectors, characterised by the extended hub having a first needle bush bearing positioned on outer surface thereof; a disc brake clamp unit having a brake disc, the brake disc coaxially mounted on the extended hub, the disc brake clamp unit configured to arrest rotation of the brake disc, the disc brake clamp unit connecting to a hand brake lever of a hand brake; an epicyclic transmission unit having a planet gear band, a sun gear, a ring gear and a plurality of planetary gears, the planet gear band positioned on the needle bush bearing, the planet gear band having a plurality of arms that receive a planetary gear shaft through respective openings thereof, each planetary gear shaft having a second needle bush bearing positioned thereon, each second needle bush bearing respectively receiving the planetary gear thereon, the sun gear positioning on the extended hub, the sun gear meshing with the plurality of planetary gears, the ring gear configured to receive momentum through the planetary gears in a direction reverse to rotation of the sun gear on arrested motion of the planet gear band, the planet gear band connecting to the brake disk of the disk brake unit to transfer momentum to the ring gear; a clock spring torque storage module having an inner casing ring band, a one way clutch bearing, an inner casing, a booster/ clock spring and an outer casing, the one way clutch bearing positioned on the extended hub, the one way clutch bearing receiving the inner casing thereon, the inner casing configured to receive momentum transfer from the ring gear, the outer casing having a sinusoidal contoured surface, the clock spring configured to be coiled during rotation of the inner casing in a direction opposite to rotation of rear wheel; and a strip chassis unit bolted on a shaft of the conventional hub, the strip chassis unit having a spring calibrated restraint wheel loaded with a calibration screw and a spring, the spring calibrated restraint wheel configured to engage with the sinusoidal contoured surface of the outer casing to arrest the outer casing from spinning below a predetermined torque.