DeWalt Battery Won't Charge Solid Red Light — What the LED Code Means

Quick answer

• A solid red light on your DeWalt charger indicates that the battery pack is not charging.
• This can occur due to a faulty battery, charger, or environmental conditions.
• Ensure the battery is not too hot or cold, as lithium-ion batteries won't charge outside of the safe temperature range.
• If the issue persists after checking these factors, consider contacting DeWalt for warranty service or replacement.

Symptoms

When your DeWalt battery won't charge, you may notice the following symptoms:

• The charger displays a solid red light, indicating that it is not charging the battery.
• No sounds or activity from the charger, suggesting it is not processing the battery.
• If you attempt to use the tool with the battery installed, it may not power on or may show diminished performance.
• If the battery is cold (below 32°F), the charger may not indicate a fault but simply refuse to charge.

Quick checks

Before diving into deeper troubleshooting, verify these quick checks:

1. Check the temperature: Ensure the battery is within the safe charging temperature range (above 32°F). If it's cold, let it warm up to room temperature.
2. Inspect the battery: Look for any visible signs of damage, such as swelling, corrosion, or punctures. A damaged battery should not be used.
3. Examine the charger: Ensure the charger is functioning correctly by testing it with another compatible battery.
4. Verify connections: Make sure the battery is seated properly in the charger and that there is no debris in the contacts.
5. Confirm the charger model: Ensure you’re using the correct charger model for your battery (e.g., DeWalt DCB115 for 20V MAX batteries).

Step-by-step fix

1. Remove the battery: Always start by removing the battery from the charger and the tool to ensure safety.

2. Inspect the battery contacts: Clean the battery terminals with a dry cloth to remove any dirt or corrosion. This ensures a good electrical connection.

3. Check the charger LED: Plug the charger back in and observe the LED pattern. A solid red light means charging is not occurring. If it shows a different pattern, refer to the charger’s manual for interpretation.

4. Test another battery: If possible, test the charger with another compatible battery. If it charges, the original battery may be faulty.

5. Charge in a warm environment: If the battery was cold, allow it to warm up to room temperature before attempting to charge again. This can help reset the battery management system (BMS).

6. Replace the battery if needed: If none of the above steps resolve the issue, consider replacing the battery. A new battery, like the DeWalt 20V MAX XR 5.0Ah Battery (DCB205), can restore functionality.

   View DeWalt 20V MAX XR 5.0Ah Battery (DCB205) on Amazon (paid link)
   View DeWalt 20V MAX XR 5.0Ah Battery (DCB205) on Home Depot (paid link)

If it still isn't working

If the battery still won’t charge after following the steps above, consider these options:

• Check warranty status: If your battery is still under warranty, contact DeWalt customer service for support or replacement options.
• Visit a service center: If you're unsure about the battery's condition, take it to an authorized DeWalt service center for a professional evaluation.
• Replacement: If the battery is out of warranty and deemed faulty, purchasing a new battery may be the most practical solution.

FAQ

Why is my DeWalt battery not charging?
A solid red light on the charger indicates that the battery is not charging, which could be due to temperature issues, a faulty battery, or a malfunctioning charger.

What should I do if my battery is swollen?
Swollen batteries should never be used. Dispose of them safely at a recycling center or a retailer that accepts battery recycling.

Can I use a different charger for my DeWalt battery?
Always use the specified charger for your battery model. Using an incorrect charger can lead to charging issues or damage.

What temperature should my battery be before charging?
Lithium-ion batteries should be charged at temperatures above 32°F (0°C). If the battery is colder, allow it to warm up before charging.

How do I know if my charger is working?
Test the charger with another compatible battery. If it charges that battery successfully, the charger is functioning properly. If not, it may need servicing.