| 摘要 |
PROBLEM TO BE SOLVED: To properly inform that battery residual amount becomes small, in an electric tool capable of using plural kinds of storage batteries.SOLUTION: If battery voltage is higher than V, it can be determined that a storage battery B is equipped. In that case, a microcomputer checks a magnitude relation between thresholds Vand Vto the battery voltage and the storage battery B, thereby deciding which of a display 1 and a display 2 should be set. If the battery voltage is Vor less, regardless which of a storage battery A and the storage battery B is equipped, a display 0 is set. On the other hand, in a case of V<the battery voltage≤V, the microcomputer recognizes a kind of the storage battery, on the basis of output voltage of the storage battery when a motor is driven.SELECTED DRAWING: Figure 6 |
