To sort of answer your question. If one turns on their flashlight only to find the batteries are bad or no longer working, sop is to replace batteries and go about your task. If one were to measure one of the ‘bad’ batteries with a DVM set to dc volts, one would measure almost the exact voltage the battery is rated at. Problem is, it is incapable of producing current or amperage necessary to make the lamp or bulb illuminate.
Read past posts by Hotrod Lincoln on this issue. He explains it very well.
