Milwaukee Battery Not Charging: How to Fix?

Milwaukee Battery Not Charging: How to Fix?

In the world of technology, batteries play a crucial role in powering our everyday devices. However, sometimes we encounter issues with battery charging that can be frustrating and inconvenient. One common problem that many users face is their Milwaukee battery not charging.

If you are experiencing this issue, don’t worry – you are not alone. In this article, we will discuss the possible reasons for your Milwaukee battery not charging and provide you with effective solutions to fix it.

What Is Milwaukee Battery?

Before we begin exploring the troubleshooting steps, let’s first gain a comprehensive understanding of what the Milwaukee battery entails. Milwaukee Electric Tool Corporation, a globally recognized manufacturer, specializes in producing top-notch heavy-duty power tools, hand tools, and accessories exclusively designed for professional users. Notably, their exceptional product line encompasses a range of high-performance lithium-ion batteries renowned for their extended run time and exceptional durability. These batteries are engineered to empower professionals with unwavering reliability and optimal performance, ensuring they can tackle even the most demanding tasks with ease and confidence. [1]

What Is Milwaukee Battery?

Reasons Why The Milwaukee Battery Won’t Charge

There are several factors that can contribute to the Milwaukee battery not charging effectively. One of the most common culprits is a faulty charger, which can have issues like loose connections or damaged cables that prevent a proper charge from occurring. It’s important to ensure that the charger is in good condition and properly connected to the battery.

Another factor to consider is incorrect charging techniques. Using an incompatible charger or not allowing the battery to fully discharge before recharging it can hinder the charging process. It’s recommended to use the appropriate charger for your Milwaukee battery and to follow the manufacturer’s guidelines for charging.

Lastly, a defective battery can also lead to charging difficulties. This may be due to internal damage or a decreased capacity of the battery. If you suspect that your battery is defective, it’s advisable to contact the manufacturer or a professional to assess and resolve the issue.

By examining these causes in more detail, we can gain a better understanding of how to troubleshoot and effectively resolve the issue of a Milwaukee battery not charging. Taking the time to identify and address these factors can help ensure optimal charging performance and prolong the lifespan of your battery. [1]

Milwaukee Battery Terminals

First Terminal: Positive Terminal

The positive terminal, which is typically identified by a plus sign, is connected to the red wire of the battery. This terminal plays a crucial role in the operation of the device as it serves as the power source, supplying electrical energy. Additionally, during the charging process, the positive terminal receives electrons from the charger, facilitating the replenishment of the battery’s energy reserves. [1]

Second Terminal: Negative Terminal

The negative terminal, which is typically marked with a minus sign and connected to the black wire of the battery, plays a crucial role in the charging process. It acts as an outlet for excess electrons, ensuring a balanced flow of electricity and completing the circuit.

To maintain a proper connection between the battery and the device, it is important to regularly clean the battery terminals. Over time, these terminals can accumulate dirt, debris, and corrosion, which can hinder efficient charging. By using a cotton swab dipped in rubbing alcohol to gently clean the terminals, you can effectively remove any buildup and optimize the charging performance. Taking this simple step can help prolong the lifespan of your battery and ensure uninterrupted power supply for your device. [1]

Milwaukee Battery Terminals

Three Hidden Terminals

In addition to the positive and negative terminals, there are three important hidden terminals on the Milwaukee battery that play a crucial role in optimizing its performance. These terminals serve as communication channels between the charger and the battery, enabling the exchange of vital information.

The first hidden terminal is equipped with a temperature sensor, meticulously monitoring the internal temperature of the battery throughout the charging process. This sensor acts as a guardian, detecting any signs of overheating and taking immediate action to prevent charging. By doing so, it effectively safeguards against potential hazards and ensures the safety of the battery and its surroundings. [1]

Fifth Terminal: Charge Indicator

The fifth terminal, known as the charge indicator, plays a crucial role in keeping users informed about the battery’s charging status. By providing a visual display of the battery’s charge level, it enables users to easily determine when the battery is fully charged and ready for use. This feature not only ensures convenience but also helps optimize battery usage by eliminating the guesswork associated with charging times. So, whether you’re in a hurry or planning for extended usage, the charge indicator offers valuable information to help you make the most of your battery-powered devices. [1]

How To Charge A Milwaukee Battery?

To effectively charge your Milwaukee battery, follow these simple steps:

  1. Gather the necessary materials: Ensure that you have the appropriate charger for your Milwaukee battery and a clean cloth or cotton swab to clean the terminals if needed.
  2. Prepare the battery: Before charging, ensure that the battery is cool to touch and free of any dirt, debris, or corrosion on its terminals. If necessary, use a cotton swab dipped in rubbing alcohol to gently clean the terminals.
  3. Connect the charger: Insert the charger into an electrical outlet and connect it to the battery’s positive and negative terminals.
  4. Monitor charging progress: Depending on your device and its battery, the charging time may vary. Keep an eye on the charge indicator or check periodically to ensure that the battery is charging properly.
  5. Disconnect and store: Once your battery is fully charged, disconnect it from the charger and store it in a cool, dry place for future use. [4]

By following these steps and paying attention to potential issues or factors that may hinder charging, you can effectively charge your Milwaukee battery and maintain its optimal performance.

How To Charge A Milwaukee Battery?

Check The Charger With A Multimeter First

If you suspect that your Milwaukee battery is not charging properly, it’s important to first check the charger with a multimeter before assuming there is an issue with the battery. A multimeter is a handheld device used to measure voltage, current, and resistance in electrical circuits.

To check the charger, follow these steps:

  1. Set the multimeter to DC Voltage mode. This mode allows you to measure the direct current (DC) output of the charger accurately.
  2. Connect the positive lead of the multimeter to the charger’s positive terminal and the negative lead to the charger’s negative terminal. This ensures that you are measuring the voltage across the charger correctly.
  3. Once the leads are properly connected, take a voltage reading. Make sure to refer to the manufacturer’s specifications for the recommended voltage range. If the reading falls within this range, it indicates that your charger is functioning properly.
  4. On the other hand, if there is no voltage reading or the measured voltage falls outside the recommended range, it suggests that there may be an issue with your charger. In such cases, further inspection or replacement might be necessary to ensure proper charging functionality. [4]

By following these detailed steps, you can effectively assess the performance of your charger and take appropriate action if needed.

Clean Off The Terminals On The Battery

As mentioned earlier, keeping the battery terminals clean is essential for efficient charging. Over time, dirt, debris, and corrosion can accumulate on the terminals, hindering the flow of electricity and affecting the battery’s performance.

To clean off the terminals on your Milwaukee battery, follow these simple steps:

  1. Prepare a solution: Mix equal parts of baking soda and water to create a cleaning solution.
  2. Disconnect the battery: Before cleaning, ensure that the battery is disconnected from any power source and remove it from the device.
  3. Apply the solution: Dip a clean cloth or cotton swab into the cleaning solution and gently rub it on the terminals to remove any buildup. For tougher corrosion, you may need to apply more pressure or use a wire brush.
  4. Wipe off with clean water: Once the buildup is removed, wipe the terminals with a cloth dipped in clean water to remove any residue from the solution.
  5. Dry and reassemble: Finally, dry the terminals thoroughly before reconnecting them to your device or storing them for future use. [4]

Clean Off The Terminals On The Battery

Check That There Is Power In The Outlet

Sometimes, the issue may not be with your charger or battery but with the electrical outlet itself. Before assuming that your Milwaukee battery is not charging, it’s crucial to check that there is power in the outlet.

To check for power in an electrical outlet, you can follow these simple steps:

  1. Plug in a different device: Start by selecting a functional device, like a lamp or phone charger, and connect it to the outlet. Make sure the device is known to be working properly.
  2. Check for power: Observe if the device turns on when connected. If it does, it indicates that the outlet has power. However, if the device fails to turn on, it suggests that there might be an issue either with the outlet itself or with your home’s electrical system.

By following these steps, you can easily determine whether the electrical outlet is supplying power or if further investigation is necessary.
In such cases, it’s best to consult a professional electrician to assess and address any potential issues with the electrical outlet. By doing so, you can ensure a safe and functional charging experience for your Milwaukee battery. [4]

Hold The Power Button

If you have tried all the above steps and your Milwaukee battery is still not charging, there may be an issue with the device or its power button. In some cases, holding down the power button for a few seconds can reset the device and allow it to start charging again.

To hold the power button on your Milwaukee battery, follow these simple steps:

  1. Locate the power button: The power button is typically located on the device’s body or handle and may be labeled with a symbol, such as a circle with a line through it.
  2. Press and hold: Using your finger or a small tool, press and hold the power button for 10-15 seconds.
  3. Observe for changes: After releasing the power button, observe if the charging indicator lights up or if there are any signs of charging. If so, it suggests that the device has reset, and the battery should start charging again.

If your Milwaukee battery still fails to charge after trying these steps, it may be time to consider replacing it. However, by following these tips and techniques, you can prolong the life of your battery and ensure it stays charged and ready for use whenever you need it. [2]

Hold The Power Button

Troubleshoot Your Cable, Charger, Outlet & Case

In addition to the above steps, there are a few other factors that may affect the charging of your Milwaukee battery. These include a faulty cable or charger, a damaged outlet, or even a protective case interfering with the connection.

To troubleshoot and identify these potential issues, you can follow these tips:

  • Try different cables and chargers: If possible, try using a different cable or charger to see if the issue lies with them. If your battery charges with a different cable or charger, it indicates that they need to be replaced.
  • Inspect the outlet: Check for any visible damage to the outlet, such as loose connections or burnt marks. If there are any issues, it’s best to call a professional electrician.
  • Remove the case: If you are using a protective case for your device, try removing it and connecting the charger directly to see if it makes a difference. [2]

By troubleshooting these components, you can eliminate them as potential causes for your Milwaukee battery not charging and determine the best course of action to take.

Troubleshoot Your Battery Charge Indicator

The battery charge indicator on your Milwaukee device is designed to inform you of the battery’s current level and charging status. However, if the indicator is not functioning correctly, it can be challenging to determine why your battery is not charging.

To troubleshoot your battery charge indicator, you can follow these steps:

  1. Consult the manual: The first step should always be to consult the user manual for your device. It may have specific instructions on how to troubleshoot and reset the battery indicator.
  2. Try resetting: If the manual does not provide any guidance, you can try resetting your device by removing the battery from the charger, waiting a few seconds, and then reconnecting it.
  3. Contact Milwaukee support: If all else fails, it’s best to contact Milwaukee’s customer support for further assistance and potential solutions. [2]

By troubleshooting your battery charge indicator, you may be able to identify the issue with your Milwaukee battery not charging and resolve it effectively. Always refer to your device manual or seek professional help when unsure of how to troubleshoot technical issues.

Troubleshoot Your Screen

In some cases, the issue may not be with the battery but with your device’s screen. If your Milwaukee battery is fully charged but the screen does not turn on or display any information, it can be a cause for concern.

To troubleshoot your device’s screen, you can follow these steps:

  1. Check for power: Ensure that the device has enough charge and is turned on. If it does not turn on, try charging it using a different outlet or charger.
  2. Check for damage: Inspect the screen for any visible cracks or damages that may affect its functionality.
  3. Restart the device: Sometimes, a simple restart can resolve any technical issues with the screen. Hold down the power button for 10-15 seconds to restart the device.

If your screen still does not function properly after trying these steps, it’s best to contact Milwaukee’s customer support for further assistance. They may have specific troubleshooting steps or suggest sending in the device for repairs if needed. [2]

Troubleshoot Your Screen

Consider Replacing The Battery

If your Milwaukee battery continues to have issues charging after trying all the above steps, it may be time to consider replacing it. Over time, batteries can degrade and lose their ability to hold a charge effectively.

When purchasing a new battery for your device, make sure to buy it from an authorized dealer or directly from Milwaukee itself. This ensures that you are getting a genuine product that is compatible with your device.

By following these tips and troubleshooting techniques, you can prolong the life of your Milwaukee battery and keep it charged for all your projects and tasks. Regular maintenance and proper handling are key to ensuring a safe and functional charging experience for your Milwaukee battery. Never hesitate to seek professional help or contact customer support if you encounter any issues beyond your technical expertise. [3]

Advantages Of Milwaukee Battery

Aside from being a reputable and reliable brand, there are several advantages to using Milwaukee batteries for your power tools. Some of these include:

  • Long-lasting charge: Milwaukee batteries are known for their long-lasting charge, allowing you to work on projects without frequent interruptions for charging.
  • Fast-charging capabilities: With rapid chargers available, you can quickly recharge your Milwaukee battery and get back to work in no time.
  • Compatibility: Milwaukee batteries are designed to be compatible with a wide range of devices, giving you the flexibility to use them for multiple tools.
  • Durable design: Milwaukee batteries are built to withstand tough working conditions and have a longer lifespan compared to other brands. [3]

Disadvantages Of Milwaukee Battery

While Milwaukee batteries have many advantages, there are also some disadvantages to consider:

  • Higher cost: Compared to other brands, Milwaukee batteries may be more expensive.
  • Limited availability: As a major brand in the power tools market, Milwaukee may not have as many retailers or options for purchasing their batteries.
  • Potential compatibility issues: While rare, there may be instances where a Milwaukee battery is not compatible with a specific device or tool. [3]

Safety Precaution

When handling any electronic device or battery, it’s crucial to prioritize safety. Here are some general safety precautions to keep in mind when using Milwaukee batteries:

  • Read the manual: Always refer to the user manual for your device or battery before use. It may contain important safety instructions and guidelines.
  • Use proper charging equipment: Only use chargers designed for your specific battery. Attempting to use a different charger may result in damage or accidents.
  • Store batteries correctly: Keep batteries away from heat, water, and extreme temperatures as they can affect their functionality.
  • Dispose of old batteries properly: Do not dispose of old batteries in the trash. Contact your local waste management agency for guidance on proper disposal methods. [3]

Safety Precaution


Can MILWAUKEE batteries be repaired?

It is not recommended to attempt to repair a Milwaukee battery on your own. If you encounter any issues, it’s best to contact Milwaukee’s customer support for assistance or send the device in for repairs if needed.

How do I know if my MILWAUKEE battery is bad?

Some signs that your Milwaukee battery may be bad include not holding a charge, taking longer to charge, or experiencing sudden power loss. You can also check the battery’s voltage using a multimeter to determine its health.

Do Milwaukee batteries go bad?

As with all batteries, Milwaukee batteries can degrade over time and eventually go bad. This is normal wear and tear that can be prolonged by proper maintenance and handling. It’s recommended to replace your battery if it no longer holds a charge effectively. Overall, taking good care of your Milwaukee battery will ensure its longevity and optimal performance for all your power tool needs. If you encounter any issues or have further questions, don’t hesitate to reach out to Milwaukee’s customer support for assistance. They are always available to help and provide solutions for their customers.

How do you diagnose a dead battery?

If your Milwaukee battery is not holding a charge or will not turn on, it may be considered dead. To diagnose this issue, you can try the following steps:

  1. Inspect the battery: Check for any visible damage or signs of wear on the battery. If there are cracks or leaks, it may be time to replace the battery.
  2. Test with a multimeter: Using a multimeter, test the battery’s voltage. If it reads below its designated voltage for full charge, the battery may be dead.
  3. Use another device: If possible, try using the battery in another device to see if it functions properly. If it works in one device but not the other, there may be an issue with the original device rather than the battery itself.

How do you reset a dead battery?

Milwaukee batteries do not have a reset button or function. If your battery is not holding a charge effectively, it’s best to contact Milwaukee’s customer support for assistance or consider purchasing a new battery. Attempting to reset the battery on your own may result in further damage. Overall, proper maintenance and handling are key to maintaining a healthy and functional Milwaukee battery.

Useful Video: Fix That Milwaukee M18 Battery That Won’t Charge.


In conclusion, Milwaukee batteries are high-quality and efficient power sources for your power tools. With their long-lasting charge and durable design, they are a reliable choice for any project. However, it’s important to keep in mind proper safety precautions when handling these electronic devices and to consider potential disadvantages such as cost and compatibility issues. If you encounter any problems with your Milwaukee battery, reach out to customer support for assistance and always prioritize safety when using electronic devices. With proper care and maintenance, your Milwaukee battery can last for years to come. So keep working on those projects without interruption, thanks to the power of Milwaukee batteries!