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How to Rebuild a Drill Battery: A Step-by-Step Guide to Getting Your Power Drill Back in Action

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Written By John Gibbs




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Are you looking for an easy step-by-step guide on how to rebuild a drill battery? If so, you’ve come to the right place. In this article, you’ll learn how to replace the cells of a drill battery and get it working again. We’ll also explore how to test the new cells and ensure that your drill battery is up to the task. By the end of this guide, you’ll have your drill battery rebuilt and ready for use.

Materials Needed

Materials Needed

  • Cordless drill battery
  • Safety glasses
  • Screwdriver
  • Soldering iron
  • Solder
  • Wire cutters
  • Wire strippers
  • Multimeter

To rebuild a cordless drill battery, you’ll need these essential materials: safety glasses, a screwdriver, a soldering iron, solder, wire cutters, wire strippers, and a multimeter.

Dismantling the Battery

Dismantling The Battery

To begin the process of rebuilding a drill battery, the battery must first be dismantled. Here’s how:

  • Remove the Battery Cover – First, unscrew or unclip the battery cover and set aside.
  • Unplug the Wires – Next, carefully unplug the wires from the battery terminals.
  • Remove the Cells – Once the wires are disconnected, use a flat head screwdriver to gently pry the cells away from the battery housing.
  • Clean the Terminals – Finally, use a cloth and some rubbing alcohol to clean the terminals and the interior of the battery housing.

Once the battery is dismantled, you can begin to rebuild it. This guide will help you understand how to fix a drill battery and bring your drill back to life.

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Cleaning the Battery

The battery must be cleaned before it can be put back together. To do this, first use a damp cloth to wipe away any dirt and debris. Be sure to clean any contacts and ports, as these are crucial for the proper functioning of the battery.

Use a small brush to scrub off any corrosion that may have built up over time. If the corrosion is particularly stubborn, you may need to use a stronger cleaning agent, such as vinegar or baking soda. Once the corrosion has been removed, use a dry cloth to wipe away any residue.

Finally, use a cotton swab to apply a thin layer of electrical contact cleaner to all the contacts and ports. This will help ensure that the battery continues to function correctly.

Once all the contacts and ports have been cleaned, the battery can be reassembled.

Testing the Battery

Testing The Battery

Before reassembling the drill battery, it is important to test it. This will ensure that the battery is working properly and will help to identify any issues that need to be addressed.

To test the battery, you will need a multimeter. Set the multimeter to the voltage setting and connect the leads to the battery terminals. The voltage should be within the range specified in the drill battery’s manual. If the voltage is outside of the acceptable range, the battery needs to be replaced.

Voltage Setting Voltage Range
18V 17-20V
24V 22-27V
36V 33-40V

Once the voltage has been checked, the multimeter should be set to the Ohms setting. Connect the leads to the battery terminals and the resistance should be within the range specified in the drill battery’s manual. If the resistance is outside of the acceptable range, the battery should be replaced.

Ohms Setting Resistance Range
18V 0.2-1.0 Ohms
24V 0.3-1.3 Ohms
36V 0.4-1.6 Ohms

Once the battery passes both tests, it is ready to be reassembled and reinstalled in the drill.

Replacing the Battery Cells

Replacing The Battery Cells

  • Unscrew the case of the drill battery and remove the old cells, being careful not to cause any physical damage.
  • Check the voltage of the old cells and purchase new replacement cells with the same voltage.
  • Insert the new cells into the drill battery, taking care to ensure they are properly connected.
  • Screw the case of the drill battery back together.

Test the drill battery to ensure the new cells are working properly.

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Testing the New Cells

Testing The New Cells

  1. Connect the new cells to the drill battery.
  2. Charge the drill battery for at least four hours.
  3. Check the voltage of the drill battery by setting the multimeter to 20V and connect the red probe to the positive post and the black probe to the negative post.
  4. Compare the voltage reading with the voltage rating of your drill battery. The voltage should be within 5% of the rating.
  5. Test the drill battery for performance by drilling into a piece of wood. If the battery is functioning correctly, the drill should be able to penetrate the wood.

Reassembling the Battery

Reassembling The Battery

Before reassembling the battery, make sure that all the components are clean and in good condition.

Step 1: Place the battery cells in their respective slots. Secure them using the screws provided.

Step 2: Connect the positive and negative terminals of the battery cells.

Step 3: Connect the battery terminals to the main circuit board.

Step 4: Connect the battery wires to the circuit board.

Step 5: Place the battery cover and secure it with the screws.

Step 6: Connect the battery to the charger and charge it until it is fully charged.

Step 7: Disconnect the battery from the charger.

Step 8: Test the battery by connecting it to the drill and turning it on.

Step Description
1 Place the battery cells
2 Connect the battery terminals
3 Connect to the main circuit board
4 Connect the battery wires
5 Place the battery cover
6 Connect to the charger
7 Disconnect from the charger
8 Test the battery

Testing the Reassembled Battery

Before considering your drill battery rebuilt, it is important to test it. To do so, plug it into your drill or any other compatible device and see if it powers up. If it does, it is a sign that you have successfully reassembled the battery and it works.

If the drill battery does not power up, you may have to check individual parts. To do this, use a multimeter to measure the voltage of each cell. The voltage of a cell should be between 1.2V and 2V.

You can also check the wiring of the battery. Make sure that none of the wires have come undone or broken. Check the connections between the cells and the cables to make sure they are secure.

If everything seems in order, try charging the battery. If it charges successfully and powers up, then you have successfully rebuilt your drill battery.

Congratulations! You have successfully rebuilt your drill battery. Be sure to take care of it to make sure it lasts a long time.

Frequently Asked Questions

What kind of tools do I need to rebuild a drill battery?

Rebuilding a drill battery requires some basic tools and supplies. You will need:

  • Safety glasses to protect your eyes
  • Pliers to hold and cut wires
  • Screwdriver to open the battery case
  • Multimeter to test the battery cells
  • Soldering Iron to rebuild the battery cells
  • Battery cells to replace the old ones
  • Cable ties to secure the new cells

You may also need a few other items depending on the type and age of the battery.

How long does it take to rebuild a drill battery?

Rebuilding a drill battery typically takes 2-3 hours. This includes the preparation of the battery, the disassembly of the cells, the cleaning of the components, the assembly of the cells, and the reassembly. The exact time may vary depending on the number of cells and the complexity of the rebuild.

  • Prepare the battery – 10 minutes
  • Disassemble the cells – 20 minutes
  • Clean the components – 20 minutes
  • Assemble the cells – 20 minutes
  • Reassemble the battery – 10 minutes

Is it Possible to Rebuild a Drill Battery Multiple Times?


  • It may be possible to rebuild a drill battery multiple times if the battery cells are in good condition and have not been damaged.
  • If all the cells are in good condition, then it is possible to rebuild the battery and restore its original performance.
  • In some cases, you may be able to rebuild the battery more than once, depending on the condition of the cells.
  • It is also possible to rebuild the battery using a different type of cell, which may improve its performance.


  • Rebuilding a drill battery multiple times may not be feasible if the cells are damaged or not in good condition.
  • In some cases, it may not be possible to rebuild the battery even once due to the damage or age of the cells.

What safety precautions should I take while rebuilding a drill battery?

  • Wear the right protection – Wear safety goggles, gloves, and a dust mask while rebuilding your drill battery. This will protect you from any hazardous material that may be present.
  • Read the manual – Before starting the rebuilding process, make sure to read the instruction manual carefully. This will give you an understanding of the safety precautions that must be taken.
  • Disconnect the battery – Always remember to disconnect the battery from the drill before beginning the rebuilding process. This will ensure that no harm is caused to the drill or other components.
  • Handle with care – Be careful when handling the drill battery, as it can be fragile and can be easily damaged if handled improperly.
  • Clean up after – Make sure to properly dispose of any hazardous material that may have been released during the rebuilding process. Cleaning up after yourself will help to ensure that the environment is safe.

Does it require any special knowledge or skills to rebuild a drill battery?

Rebuilding a drill battery requires an understanding of basic electrical components and a good working knowledge of the drill’s circuitry. It also requires the use of specialized tools and soldering skills. Safety is paramount, so it is important to wear safety glasses and gloves when doing any soldering. Additionally, familiarity with the schematic diagrams of the drill and its components is highly recommended.


Rebuilding a drill battery is not as difficult as it might seem. With the right tools and proper guidance, you can easily bring your drill battery back to life. Carefully follow the steps outlined in this article, and you will have your drill battery ready for use in no time.



About John Gibbs

Hello everyone! My name is John Gibbs. I am 60 years old and have been in the family construction business all my adult life. Construction is not only my profession but also my passion. I know everything about building and repair materials, tools, advanced methods, techniques, and approaches. I will share the same knowledge with you in my articles.

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