dewalt 20v battery says fully charged but not working

Dewalt 20V battery showing full charge but not functioning? Possible causes include battery wear, dirty contacts, protection circuit tripping, or faulty tool. Troubleshoot by cleaning contacts, resetting the protection circuit (if applicable), testing with another battery or tool, and contacting Dewalt support for assistance.

If you rely on cordless power tools for your work or daily projects, you probably know how frustrating it can be when your battery pack appears to be fully charged but won’t run the tool for more than a few seconds or doesn’t work at all.

While some battery problems are due to normal wear and tear or misuse, others can be caused by manufacturing defects, environmental factors, or storage conditions. In this guide, we’ll discuss a common issue that affects dewalt 20v batteries and how you can diagnose and fix it without spending money on a new battery or a professional repair service. By following our steps, you may be able to revive your dewalt battery and extend its lifespan.

Why Dewalt Battery Says Fully Charged but Not Working

If your DeWalt battery is indicating that it’s fully charged but is not working when you attempt to use it, there could be a few possible reasons for this issue:

  1. Battery Age and Wear: Over time, rechargeable batteries can degrade and lose their capacity to hold a charge. If the battery is old or has been used extensively, it might not be able to deliver the necessary power to the tool even if it shows a full charge.
  2. Battery Contacts and Connections: Ensure that the battery contacts on both the battery and the tool are clean and free of debris. Dirty or corroded contacts can prevent proper power transmission between the battery and the tool.
  3. Battery Protection Circuit: Lithium-ion batteries often include built-in protection circuits that can sometimes trip if the battery is subjected to overcharging, over-discharging, or overheating. This can lead to the battery showing a full charge but not actually delivering power. If this is the case, the protection circuit may need to be reset or the battery may need to be replaced.
  4. Faulty Battery Cells: If one or more cells within the battery pack are faulty or damaged, it can result in the battery not being able to provide sufficient power, even if it appears fully charged.
  5. Tool Malfunction: It’s also possible that the issue is with the tool itself rather than the battery. A malfunctioning tool might not be able to properly draw power from the battery.

Symptoms Of Dewalt 20V Battery Not Working

dewalt 20v battery says fully charged but not working

Dewalt 20v batteries are powerful and can handle heavy-duty tasks. However, if you are having trouble with your dewalt 20v battery, there could be several reasons why it isn’t working properly.

Common Signs of dewalt 20v battery says fully charged but not working

  • The battery doesn’t hold the charge: One of the primary indicators that your dewalt 20v battery is not working is that it doesn’t hold the charge. If you have charged the battery to its fullest capacity and it still doesn’t hold the charge, it’s a sign that your battery needs to be replaced.
  • Reduced power output: Your dewalt 20v battery may not be delivering the expected power output if it’s not working correctly. You may notice reduced power output while using the tool with your dewalt battery. This problem typically indicates that the battery needs replacement.
  • Overheating battery: If your dewalt 20v battery overheats during use, it’s a sign that there are problems with the battery. One of the most likely causes is that the battery is old and needs to be replaced.
  • Swollen battery: If you notice that your dewalt 20v battery is swollen, it’s a clear indication that something is wrong with it. The swelling of the battery could be due to internal damage, and it could pose a potential danger to the user. It is best to replace the battery as soon as possible.

How To Identify Such Signs?

You can identify the early signs of a non-working dewalt 20v battery by closely monitoring its performance.

  • Check the battery indicator: The first and simplest way to identify the warning signs is by checking the battery indicator. If you see that the battery is fully charged, but the tool isn’t working, take it as a warning, and look out for other symptoms.
  • Assess tool performance: The tool’s performance provides useful insight into the state of your battery. If your tool doesn’t perform to its expected standard, it could be an indication of a poorly functioning dewalt 20v battery.
  • Check the battery temperature: If the battery becomes too hot during use, it is a sign that something is wrong. A dewalt 20v battery should remain at a reasonable temperature during use.
  • Inspect the battery: Regular inspection of the battery could help you identify if it is swollen or damaged. A defective battery can be identified by visible changes in the battery’s structure.

The main indicators of a malfunctioning dewalt 20v battery are the inability to hold a charge, reduced power output, overheating, and swelling. Monitoring the tool’s performance, inspecting the battery, checking the temperature, and assessing the battery’s indicator can help you identify these signs.

Remember to replace the battery as quickly as possible if any of these symptoms arise to avoid further problems.

Causes Of Dewalt 20V Battery Not Working

If you own a dewalt 20v battery, you might have experienced a situation where the battery says it’s fully charged, but when you try to use it, nothing happens. In this blog post, we’ll explore the different causes of why your dewalt 20v battery might not be working.

Understanding these potential causes will help you diagnose the issue and find a solution quickly.

Electrical Faults

One of the most common reasons why your dewalt 20v battery may not be working is due to electrical faults.

  • Loose or corroded battery terminals: Over time, the terminals of the battery can become loose or corroded, leading to poor connections. Make sure you clean the terminals with a fine wire brush or replace them if needed.
  • Overheating of the battery: If you work in high-temperature environments, it can lead to overheating of the battery, which can cause damage to the charging circuit or other components. Avoid using the battery in direct sunlight or hot environments.
  • Damaged battery cells: In rare cases, the battery’s individual cells can be damaged, leading to a complete failure of the battery. This problem can occur due to overcharging, overheating, or using inferior-quality chargers.

Mechanical Faults

Mechanical faults in the battery can be an issue as well. The battery casing and other components can become damaged, causing the battery to malfunction.

  • Physical damage to the battery casing: If you accidentally drop the battery, it can lead to physical damage to the casing, which can cause internal damage as well.
  • Damage to the internal components: Sometimes, the internal components of the battery can sustain damage due to water exposure, exposure to chemicals, or high-impact use. Make sure you protect the battery from exposure to these environmental hazards.
  • Dead battery: If the battery has reached the end of its useful life, it will not hold a charge or work efficiently anymore, leading to a complete failure.

Understanding the potential causes of why your dewalt 20v battery might not be working will help you diagnose the issue and find a solution. Always make sure you protect the battery from environmental hazards, use quality chargers, and handle the battery with care to ensure long-lasting performance.

If you have time you must read this: Dewalt Circular Saw 20V Problems

Solutions To Dewalt 20V Battery Not Working

If you’ve been using your dewalt 20v battery and find that it suddenly stops working despite indicating that it’s fully charged, it can be frustrating. However, there are several potential reasons why this could be happening, each with a unique solution.

In this guide, we’ll walk you through what you need to do to get your dewalt 20v battery working again.

dewalt 20v battery says fully charged but not working

To Proceed If You Suspect The Battery Is Not Working

If you suspect that your dewalt 20v battery isn’t working, the first thing to do is to check whether it’s actually charged. If the battery is still under warranty, contact dewalt customer service as soon as possible. They may provide you with a replacement or repair the battery for you.

If it’s out of warranty, you can try troubleshooting the battery yourself.

Overview Of Potential Solutions Depending On The Cause

There are some common reasons why a dewalt 20v battery may suddenly stop working even after indicating that it’s fully charged. In some cases, the battery may simply need to be calibrated, while in others, it may be due to a failed internal component or damaged cell.

  • Calibration: If your battery is not holding charge or has low runtime, it may simply need to be calibrated. This involves fully charging the battery, discharging it completely, and then charging it again. Give this a try before attempting any of the other solutions.
  • Internal component failure: If the battery doesn’t charge at all, the internal components may be damaged, and you’ll need to replace the battery.
  • Damaged cell: If your battery has been dropped or exposed to extreme temperatures, the cells may have been damaged. In this case, you’ll need to replace the battery.

Step-By-Step Guide On How To Address Common Issues And Ensure Optimal Battery Performance

If your dewalt 20v battery suddenly stops working, follow these steps to address common issues and ensure optimal battery performance:

  • Fully charge the battery. Ensure that it is connected to a compatible charger and that it’s fully charged.
  • Discharge the battery. Let the battery discharge completely, then unplug it from the charger.
  • Charge the battery again. Once the battery is completely discharged, charge it fully again.
  • Clean the battery terminals. Dust and rust can accumulate on the battery terminals and affect battery power. Clean them using a dry cloth or a soft-bristle brush.
  • Check the charger. Make sure that the charger is working correctly, and that there are no loose connections or frayed wires.
  • Check for damages to the battery. If your battery’s exterior is damaged, it may be impacting performance. Inspect the body of the battery for any cracks, dents, or leaks, and replace the battery if necessary.
  • Store the battery properly. Ensure your battery is stored in a cool, dry place with a temperature range between 50°f and 80°f to avoid damaging the battery’s cells.

If your dewalt 20v battery is indicating it’s fully charged but still not working, don’t worry. By following the above solutions, you can easily troubleshoot your battery and get it up and running again. Proper maintenance, charging, and storage can help your battery last longer, ensuring optimal performance for years to come.

Analysis Of Battery Charging Mechanisms

To ensure optimal battery performance, it’s important to understand how to charge dewalt 20v batteries correctly.

  • Use only dewalt chargers to charge the batteries
  • Ensure that the charger is compatible with the battery voltage and capacity
  • Avoid charging batteries in temperatures below 40°f or above 105°f
  • To charge the battery, insert it into the charger, and plug in the charger
  • The charger’s led lights will indicate when the battery is fully charged and ready to use
  • Do not leave the battery in the charger for an extended period

Importance Of Maintaining Or Servicing Dewalt 20V Batteries

Regular maintenance and servicing can help extend the life of dewalt 20v batteries and maintain optimal performance.

  • Store the batteries in a cool, dry place when not in use
  • Avoid dropping batteries or exposing them to extreme temperatures
  • Clean the battery contacts regularly with a dry cloth to ensure proper connection
  • Charge batteries before they’re fully discharged to increase their lifespan
  • If a battery isn’t working, try troubleshooting the issue before replacing it. It could be a charger issue rather than a battery issue.

By following these guidelines, you can ensure that your dewalt 20v batteries continue to provide reliable power to your tools.

Frequently Asked Questions(FAQs):

Why Is My Dewalt 20V Battery Not Working?

If your battery isn’t working despite being fully charged, it might be due to a faulty charger or damaged cells.

How Do I Fix A Dewalt 20V Battery That Won’T Charge?

You can try resetting or replacing the charger, cleaning the terminals, or replacing the damaged cells to fix the battery.

How Long Does A Dewalt 20V Battery Last?

The battery life depends on usage, temperature, and storage conditions. On average, it lasts for 2-3 years.

How Do I Maintain My Dewalt 20V Battery?

Store the battery in a cool, dry place, charge it fully before use, and avoid overcharging or deep discharging to extend its life.

Can I Use A Non-Dewalt Charger On A Dewalt 20V Battery?

It is not recommended as non-Dewalt chargers may cause damage to the battery or void its warranty. Use only Dewalt-approved chargers.


After exploring the various reasons why a dewalt 20v battery may be fully charged but not working, it is clear that there are a variety of potential issues that could be causing this problem. From battery failures and charger malfunctions to wiring and safety issues, it’s important to carefully inspect and troubleshoot each potential cause in order to identify the root of the issue.

Additionally, taking proper care of your dewalt 20v batteries by storing them in a cool, dry place and avoiding overcharging can help prevent future malfunctions. By being aware of the signs of a failing battery and regularly maintaining your dewalt tools, you can ensure that they continue to perform at their best and keep your projects powered and running smoothly.

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