Test and replace a dead car battery

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Test and replace a dead car battery

There is nothing more frustrating than sitting behind the wheel of a car, getting ready to go somewhere, only to find out that the car battery is dead. But why is your car battery dying, and what can you do to fix it? Let’s take a closer look at what can cause a car battery to fail, how to jumpstart a dead car battery, how to test a car battery, and how to replace a dead car battery.

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Possible causes of a dead car battery

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user error
A common reason for a dead car battery is simple user error. Or you accidentally left your dome light on, leaving something charged in the accessory power supply, or you used too much accessory power when you were only driving a short distance. This means that when you start the vehicle, most of the battery's power has been used, but the alternator, which returns power to the battery, does not have enough time to fully charge the battery.

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Battery Life
Another possible cause of a dead car battery is age. Most car batteries use multiple cell lead-acid cells. Each battery is filled with a dilute solution of sulfuric acid and lead. As a car battery ages, it undergoes a natural process called sulfation. Sulfation occurs when a car battery's negative plate is covered with sulfate crystals, which can build up and reduce the battery's ability to deliver power to the vehicle and cause the car to not start. If your car battery is 2 to 5 years old, this may be the culprit and it may be time to replace it.

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Battery defect
Sometimes, a dead battery can be caused by a defect in the car battery itself. If you repeatedly experience a dead battery and your vehicle or battery is new, it may be worth taking your car to a shop to have the battery tested by a mechanic to determine if it has an internal defect.

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car charging system
Sometimes, a dead car battery may not indicate a problem with the battery itself, but rather with the car's charging system. If the battery warning icon illuminates while driving, it may indicate a problem with your charging system. You should perform a mechanical inspection to see if the alternator, serpentine belt, battery cables and terminals, and alternator belt are functioning properly.

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Battery terminal corrosion
Finally, a dead car battery may indicate corrosion on the battery terminals. These are the binding posts that connect the battery to the rest of the charging system. Sometimes, corrosion that looks like white ash deposits can form between the battery terminals and cables and can cause the vehicle to lose power. You can use a wire brush and baking soda to remove corrosion from your battery. However, if this continues to happen, it may be a sign that the battery, battery cable, or terminals need to be replaced.

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8 Steps to Charging Your Car Battery
If you suddenly find that your car battery is dead, your best bet is to jump-start it with another car battery. Fortunately, charging a car battery is relatively simple if you can find some jumper cables and a willing Good Samaritan. Here are some simple steps and tips for properly charging your vehicle battery.

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1. Check jumper cables
Make sure the jumper cables are clean, the alligator clips are not corroded, and the cables do not have tears or kinks.

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2. Turn off the engines of both vehicles
Make sure both vehicles are parked and the ignition is fully off.

3. Red Death
Connect the red alligator clip to the positive terminal of the discharged battery. The positive terminal will be marked with a plus sign and usually has a red plastic flap.

4. Clamp the vehicle
Attach the red alligator clip to the positive vehicle terminal on the live vehicle. Next, connect the black alligator clip on the corresponding side to the negative terminal on the active vehicle. The negative terminal is marked with a minus sign.

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