Abstract: A battery assembly 51 for fitting a battery pack 52 to a frame of a cycle 2 comprises a battery holder 54 for fitting to the frame, and a connector portion 55 which forms an electrical connection between the battery pack 52 and wiring 90 for connecting to at least one other component of the cycle when the battery pack is held by the holder 54. The connector portion 55 is slideable in a linear direction with respect to the battery holder between an open position which provides clearance of the battery pack to be inserted into the holder and a closed position in which the connection is formed. A clamping mechanism is provided to clamp the battery pack into the battery holder when the connector portion is closed.

Abstract: An electrically assisted cycle kit (50) for fitting to a pedal cycle (2) comprises an electric motor (58) for assisting pedal cycle motion, a battery (52) for powering the motor (58), and a controller (60) for controlling the drive of the motor (58). A gear tooth sensor (65) provides a gear motion signal indicative of the speed/acceleration of motion of gear teeth (94) and valleys (95) of a gear sprocket (32) of the cycle. The controller controls the drive of the motor (58) in dependence on the gear motion signal.

Abstract: An electrically assisted cycle kit 50 for fitting to a pedal cycle 2 comprises an electric motor 58 for assisting pedal cycle motion, a battery 52 for powering the motor 58, and a controller 60 for controlling the drive of the motor 58. A gear tooth sensor 65 provides a gear motion signal indicative of the speed/acceleration of motion of gear teeth 94 and valleys 95 of a gear sprocket 32 of the cycle. The controller controls the drive of the motor 58 in dependence on the gear motion signal.