| 摘要 |
PURPOSE:To ensure an accommodation space of a battery by forming a polarity indication part of a battery by the difference between a rough part and a smooth part on the bottom of a battery box. CONSTITUTION:A polarity indication part 8 is formed by forming a rough part in a part of the bottom of a battery box 2, and the other part is made smooth. By distingwishing the rough part from the smooth part, polarity indication is easily identified. By this construction, the polarity indication part 8 is formed on almost the same surface as the bottom of the battery box 2 without large recess or projection. Thereby, a space can be decreased and the influence caused by the thickness of the battery box 2 can be prevented. |
