Note that if you recently ran the automobile you can find batteries with charge readings of 13 V or more. Just measure its current level of charge with a standard automotive voltmeter. What do you do if you have a battery without a built-in inspection window? Therefore, a green eye simply means the battery is ready for testing. It doesn't test its ability to sustain a load like a starter motor or other car accessories. The battery inspection window is a simple hydrometer that measures the level of charge. A black eye doesn't mean the battery is bad. A green eye doesn't mean that the battery is good. It's time to debunk another car battery charging information myth. Dark green or the absence of color that we'll call a black eye indicates the battery falls short of its ideal level of charge. When we look at the eye of the battery we want to see a bright green indicator. Let's debunk a myth about the battery eye. It's a good nickname, because it lets us look into the internal health of this electrical energy storage device. Although its official name is the battery inspection window we often call this an eye. On a lot of older automobiles, you'll find car batteries with a built-in hydrometer. Protective Face Shield Get the Car Battery Ready for Testing Now that's out of the way we can move on to car battery charging information that covers testing and how to charge a battery worth saving. Don't waste your time trying to charge and save a battery that belongs at the recycling center. You must remove and dispose of old batteries in poor condition, with cracked plastic cases. The only exception to the rule becomes a seven-year battery that's usually in the AGM category. Disconnect the negative side first when replacing it.ĭon't try to save an old worn out battery. ![]() Next, eliminate creating sparks using common sense techniques. Ventilate the battery compartment area with a fan. Two important things can reduce the possibility of combustion. The presence of gas above the battery usually coincides with a surface that looks moist or has an abundance of corrosion. However, following some basic rules can practically eliminate the chances of this nasty occurrence from happening. When the battery blows up it's because there's an invisible gas floating above the surface that's ignited by sparks. It's never happened to me, because I understand what makes them susceptible to ignition. In my 30 year career, I can count the number of times I've seen a battery explode on my fingers. ![]() This is why you need to wear a face shield and heavy work gloves when working around this component. I can tell you that an exploding battery, although rare, remains a possibility. Before we supply car battery charging information we need to cover quick safety tips.
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