How Do I Know My Battery Is Going Bad. First find the positive and negative terminal on the battery. This easy car battery test can help you decide if you need to replace a car battery.
The first thing that happens when the batteries in your iPhone iPad or Apple Watch begins to go bad is the more obvious battery not lasting as long as it used to. If possible keep the battery inside the garage during cold months but not directly on the concrete floor. Then take the black lead and place it on the negative terminal of the battery.
When that light comes on it means the alternator no longer charges.
It is possible that a dead or weak battery is causing your car not to start rather than a problem with the starter system. Next take the red lead of the voltmeter and place it on the positive terminal. Carefully inspect the battery cables and connections. Instead place it on the piece of wood or a carpet and connect it to the battery tender that will keep your battery in a usable condition.
