Car Tips

Car Battery Keeps Dying but Alternator is Good

There are few things more frustrating than a car battery that keeps dying. However, if you’ve had your alternator checked and it’s functioning properly, then what could be causing your car battery to die repeatedly? In this article, we will discuss some common reasons why your car battery may be dying even if your alternator is in good working condition.

Reasons Why Your Car Battery Keeps Dying

  1. Parasitic Draw: One of the most common reasons why a car battery keeps dying is due to a parasitic draw. This refers to any electrical component that continues to draw power from the battery even when the car is turned off. Common culprits include the radio, alarm systems, or any aftermarket electronics.
  2. Battery Drain: If your battery is constantly draining, it could be due to a faulty battery. Car batteries have a lifespan of about 3-5 years and may need to be replaced if they are not holding a charge properly.
  3. Corroded Battery Connections: Corrosion on the battery terminals or cables can prevent the battery from charging properly, leading to a battery that keeps dying. Ensure the battery connections are clean and tightly connected.

How can I test for a parasitic draw?

To test for a parasitic draw, you will need a multimeter. Disconnect the negative cable from the battery and set the multimeter to measure DC amps. Place the meter in series between the negative battery cable and the negative battery post. Wait a few minutes to allow the car to enter sleep mode and measure the current draw. If it’s more than 50 milliamps, there’s a parasitic draw.

Can a bad alternator still pass a test?

Yes, it’s possible for an alternator to pass a test even if it’s not working correctly. The alternator may function properly under certain conditions, but not under others. It’s important to have a comprehensive checkup of the car’s charging system.

How often should I replace my car battery?

Car batteries have a lifespan of about 3-5 years, depending on usage and weather conditions. It’s important to have the battery tested regularly and replace it if it’s not holding a charge properly.


A car battery that keeps dying can be frustrating, but it doesn’t necessarily mean that there’s a problem with the alternator. Parasitic draws, battery drain, and corroded battery connections can all cause a battery to die repeatedly. It’s important to have your car checked by a professional mechanic to determine the root cause of the problem and find a solution.

Rachael McAdams

I'm Rachael, CEO of AutoGeeX, bring unrivaled expertise and passion to the automotive industry. With extensive knowledge and a deep understanding of cars, she shares captivating tales, invaluable insights, and practical tips with readers. As an active presence in the car community, Rachael ignites excitement, revolutionizing the automotive landscape with AutoGeeX's pursuit of perfection.

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