Abstract: A charging apparatus comprises a U-shaped cell-accommodation frame structure and a power supply casing. The cell-accommodation frame structure includes an end plate and a pair of arm plates extending from the both ends respectively of the end plate, and the power supply casing is provided with a power supply plug on one surface and cell-connection contact strips on another surface. Two communicating arcuate slots and an elongate slot are formed at the free end portion of each of the arm plates of the cell-accommodation frame structure, and lugs movably engageable with the former and latter slots respectively are formed on each of the side surfaces of the power supply casing, so that the power supply casing is rotatable and horizontally movable relative to the cell-accommodation frame structure, and cells having different lengths can be accommodated in the cell accommodation space from the both sides of the openings of the space.