Seat fastening device for a bicycle

摘要

A battery holding structure for a vehicle, in particular a power-assisted bicycle is provided with an outer box (40) and an inner box (38). The outer box (40) is adopted to be secured to the vehicle and electrically connected to a power unit (34) of said vehicle. The inner box (38) is adapted to accommodate at least one battery (39) and is insertable into said outer box (40).