| 摘要 |
Battery side terminals (14, 24) arranged on first and second battery devices (1, 2) are provided on front surfaces (10D, 20D) of the battery devices so as to be at identical places with respect to lower surfaces (10C, 20C) and side surfaces (10A, 20A) as the standard. Engagement recesses (26, 28) are arranged in the front surface (20D) of a case (20) of the second battery device (2), and those portions of recesses (26, 28) which are nearer to the lower surface (20C) are formed as flat surfaces (2402, 2602) in parallel with an upper surface (20B) and the lower surface (20C). The dimension from the lower surface of the case (20) to the flat surfaces (2402, 2602) and the dimension from the lower surface (10C) of a case (10) of the first battery device (1) to an upper surface (10B) are the same. Thus, the battery devices are advantageous because the two kinds of batteries with different capacities can be used and usability is enhanced.
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