How To Fix DeWalt Battery Not Charging? – 6 Fixes!

In the world of power tools, DeWalt has long been a revered name, known for its commitment to innovation, durability, and performance. Whether it’s for professional contractors or avid DIY enthusiasts, DeWalt tools have become indispensable companions in tackling a wide range of tasks. Central to the effectiveness of these power tools is their battery system, which provides the essential energy needed to get the job done efficiently. However, even the most reliable tools can encounter issues, and one of the most frustrating predicaments users may face is a DeWalt battery that refuses to charge.

A DeWalt battery not charging is a problem that can disrupt projects, increase downtime, and lead to frustration. When faced with this issue, it’s essential to understand the potential causes and solutions to get back to work promptly. This article delves into the common reasons behind a DeWalt battery not charging, offering valuable insights and troubleshooting tips to help users navigate this challenging situation.

From faulty chargers and worn-out batteries to more complex internal issues, the culprits behind a non-charging DeWalt battery can vary. While it’s tempting to rush out and purchase a replacement battery or charger, understanding the underlying issues can save time and money, as well as extend the life of your DeWalt power tools.

In the following sections, we will explore the possible reasons for a DeWalt battery not charging, step-by-step troubleshooting procedures, and maintenance practices to prevent such issues in the future. By the end of this guide, you’ll be better equipped to diagnose and address this frustrating problem, ensuring that your DeWalt power tools remain reliable companions for all your projects.

How To Fix DeWalt Battery Not Charging?

Addressing the charging issue of your DeWalt battery pack is a relatively straightforward process, and you’ll need a few essential tools to assist in diagnosing and resolving the problem effectively. Here’s a list of tools you should have at hand before beginning the inspection and repair:

  • Speaker wire (a small piece).
  • A multimeter.
  • A fully charged secondary battery pack.
  • A set of screwdrivers.

Once you’ve gathered these tools, follow the steps outlined below to diagnose and rectify the charging problem with your DeWalt battery pack.

Fully Charge A Secondary Battery

As indicated in the list of required tools, you’ll need an additional DeWalt battery pack for this troubleshooting process. In case you don’t have an extra battery pack on hand, consider reaching out to a neighbor or a friend for assistance.

Insert the secondary battery pack into your DeWalt battery charger and keep it connected until it reaches a full charge.

Please keep in mind that this step also serves as a check to confirm the proper functionality of your DeWalt battery charger.

Place Both Battery Side By Side

After the secondary battery has reached a full charge, position both the functional and the problematic battery side by side on a table. Arrange them so that the charging pins of both batteries are facing upward.

Jump The Bad Battery

If you’ve ever jumpstarted a motorcycle or car, you’ll find this process familiar. We’ll effectively jumpstart the ailing DeWalt battery pack using a fully charged one. This action will provide the correct voltage to re-energize the lithium-ion cells within the problematic battery, bringing it back to life.

Begin by taking a piece of speaker wire and establishing a connection between the B- pin of the faulty battery and the B- of the fully charged battery. Similarly, connect the B+ pin of the faulty battery to the B+ pin of the charged battery.

Allow approximately 8 to 10 seconds for the depleted battery cells to regain the correct amperage, and then proceed to disconnect the wires.

Connect To Charger

Following the wire disconnection, place your ailing DeWalt battery pack back into the charger. This step should effectively resolve the charging issue of your DeWalt lithium-ion battery pack, indicated by the initiation of blinking charging lights.

While these steps have proven successful for many in revitalizing their dead DeWalt 4.0Ah lithium-ion battery pack, it’s worth noting that there could be additional reasons causing your DeWalt lithium-ion battery to refuse charging. In case the problem persists, there are alternative methods to address the issue.

Clean The Charging Pins

DeWalt chargers feature five charging pins that establish a connection with your battery pack to facilitate the flow of electricity. However, the accumulation of dust or debris on these pins can impede current flow, ultimately leading to charging issues.

To address this, start by unplugging the charger from the power outlet and meticulously clean the charging pins using a toothbrush. Similarly, ensure to clean the pins on the battery side as well. This maintenance step can often resolve charging problems caused by a buildup of contaminants.

Try A New Charger

DeWalt battery packs are available in various amperage and voltage ratings, typically ranging from 20V to 60V. It’s crucial to use the appropriate charger that matches the specific amperage and voltage rating of your battery pack for effective charging.

Replace The Dead Li-Ion Cell

The DeWalt 4.0Ah battery comprises eight Samsung 18650 lithium-ion cells, and if any of these cells develop issues, it can lead to charging problems. For those with a passion for DIY and a grasp of electrical circuits, it is possible to replace the damaged cell, effectively resurrecting your DeWalt battery pack.

To assist you in this process, there’s a helpful video tutorial available on how to replace dead cells within a DeWalt 5Ah lithium-ion battery pack. This resource can guide you through the necessary steps to restore your battery pack to working condition.


By diligently following the initial method, you can successfully revive your DeWalt battery, allowing it to resume charging as intended. If necessary, you can further pinpoint any dead cells with the assistance of a multimeter and then proceed with their replacement.

To aid you in this endeavor, a comprehensive video tutorial demonstrating the replacement of faulty cells within the DeWalt battery pack has been provided. Your feedback and experience with resolving the issue are greatly appreciated; feel free to share your results in the comment section below.

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