A vehicle wheel chock strap retainer that provides that different straps of different dimensions will remain securely affixed to a torque tube of a wheel chock when the chock strap retainer is inserted into the torque tube. The degree of influence of the recording condition of data recorded in the recording medium, on whether the data is correctly reproduced, is greater when the data is reproduced in accordance with the first reproduction method than with the second reproduction method. The battery assembly further includes a first thermally conductive plate having peripheral edges encapsulated within the first substantially rectangular ring-shaped peripheral wall. The second substrate has a second pattern in which third faces corresponding to the first faces and fourth faces corresponding to the second faces and making an angle of \u03b1 with the third faces are periodically arranged.