Note that for any battery problem, we recommend consulting a specialist to avoid further damaging this important component. However, to understand what typically happens to a car battery when it won’t hold a charge, let’s consider a few common causes:
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Short Circuit in One or More Cells: A battery consists of six cells. A short circuit or a break in the connection between cells can occur. These are usually manufacturing defects. If your battery is still under warranty, you may be able to get a replacement. If not, repairing it is not cost-effective.
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Low Electrolyte Level: Over time, batteries lose water, which needs to be replenished. Check the electrolyte level every six months, especially before winter. The electrolyte should cover the plates by 1.5-2 centimeters. Low levels can lead to corrosion and sulfation, damaging the battery. To correct this, simply add distilled water to each cell, up to the MAX line. Important: Never add electrolyte instead of water, as this can damage the battery. After adding water, charge the battery.
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Generator Malfunction: The generator replenishes the battery’s charge. At 2500 RPM with accessories on, the voltage should be between 13.8V and 14.5V. If it’s lower, the generator isn’t charging the battery efficiently. Issues can range from worn brushes to a faulty voltage regulator. A mechanic will be needed to diagnose and repair this.
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Electrical System Drain: Finding a drain when the engine is off can be challenging. Causes include faulty alarms, constantly lit lights, or other electrical issues. Pay close attention to aftermarket accessories. A mechanic can help identify and fix the problem.
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Battery Age: Batteries wear out over time. If your battery is old, it may simply need to be replaced.
This article outlines common reasons why a car battery might fail to hold a charge. Understanding these causes can help you address the problem more effectively.