SERVICE LIFE INDICATOR AND LEAD-ACID BATTERY WITH SERVICE LIFE INDICATOR

摘要

PURPOSE: To provide various information based on the generation of growth by detecting the generation of growth as a change of an electric parameter by a sensor part. CONSTITUTION: When growth is generated on a positive electrode plate 1, a plate body 72a is moved upward in the horizontal state, and brought into contact with the lower end of a bar body 72b, and the bar body 72b is pushed up to press a plate 711 to be pressed upward. According to it, an electric contact 712 is also deflected to be protruded upward, and makes contact with an electric contact 713. A sensor part 71 is closed thereby to operate a transmitting circuit 73 and a receiving circuit 74, and a light emitting diode 75 is lighted to detect the contact between the contacts 712, 713. Thus, the sensor part 71 detects the generation of growth as a change of an electric parameter, and generates an electric signal.