With time, AGM batteries, including OPTIMA batteries, may fail. Problems are often caused whenever a starting battery pack is found in a cycling application, which is why a deep-cycle battery pack may be the better choice.
OK, you attach it to your charger andвЂ¦CLICK so you have a seemingly bad AGM battery. The charger will not charge it even! “It needs to be a battery that is bad” you exclaim.