Battery lifetime indicator for a stopwatch

摘要

In an indication hand type stopwatch energized by a battery having a second indication hand, a minute indication hand and an hour indication hand, a battery lifetime display has a battery lifetime detective section for monitoring a voltage of the battery and a battery lifetime display circuit means connected to the battery lifetime detective section and for controlling the driving of the minute indication hand serving as a battery lifetime indication hand for displaying a battery lifetime while the stopwatch is in a non-counting mode. In the case that the battery voltage is over the predetermined voltage, the minute indication is driven by 15 steps clockwise in response to the operation of an external operation switch and in the case that the battery voltage is below the predetermined voltage, the minute indication is driven by 3 steps.