How to Jumpstart a Cordless Drill Battery

Reviving your trusty cordless drill doesn’t have to be a daunting task. When your battery falters, and your projects come to a screeching halt, it’s time to take action.

However, this action must be guided by the expertise, experience, or knowledge on handling your battery, or you will take it to its deathbed. So, how do you jumpstart a cordless drill battery?

This guide will show you how to breathe new life into your cordless drill battery. We have explored various ways to identify the problem to master the art of jumpstarting, fixing, and even repairing dead cordless drill batteries.

Say goodbye to the frustration of a dead battery and hello to uninterrupted productivity. Ready to dive in? Let’s get your cordless drill back in action by learning how to jumpstart a cordless drill battery.

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Signs of a Dead Cordless Drill Battery

The truth is, your cordless drill battery will not be in its top condition and performance forever. With continuous usage, the batteries may lose their power, get damaged, or die. When your cordless drill battery begins to show these signs of fatigue, it’s essential to diagnose the problem accurately.

More often than not, the culprit is a dead battery. However, you must know how to diagnose these problems and apply the solution immediately.

Thus, if you suspect your battery is dead, below are some indicators to help determine.

How to tell if your cordless drill battery is dead

  • Lack of Power/rapid discharge

The drop in power output is one of the primary indicators of a dead battery. If your drill used to zip through tasks effortlessly but has started to struggle even with basic drilling, your battery might be the culprit. The power loss might indicate that the battery drains faster, cannot sustain the drilling job, and needs replacement or service.

A healthy battery should hold its charge for a reasonable amount of time. If your drill loses power within minutes of use, it’s a clear sign that something is amiss.

  • Reduced Speed

If your cordless drill begins operating at a slower speed than usual, the implication is that its battery is not delivering the needed or maximum voltage. A battery that is losing its power will not have a consistent performance. Instead, you will see a situation where your dill works fine for one moment, suddenly stops, and then starts again after a break. This should signify that it is time to replace your cordless drill battery.

Other symptoms of a dead battery include

No response: Pressing the trigger on your cordless drill and failing to notice any response is a clear sign of a dead battery. Your drill won’t budge without a functional power source.

Dim Light: Many cordless drills have LED lights illuminating the work area. If the lights are noticeably dimmer than usual, it could indicate a battery problem.

Overheating: It should be a concern if you use your cordless drill and note excessive heat from your battery pack. Overheating is not only a sign that your battery is struggling to cope with the energy demands of your tool but also a safety hazard.

Odd Noises: Unusual clicking or buzzing sounds from the battery compartment can indicate internal issues. These sounds may signal a malfunction within the battery cells. Diagnosing your battery and finding the problem is paramount if you hear any of these sounds.

Bulging Battery: In severe cases, a dead battery may physically swell or bulge. This is dangerous and should be addressed immediately to prevent potential hazards.

Causes of a Dead Cordless Drill Battery

Batteries are the most essential components in cordless power tools. How long your device can operate before breaking down depends on its battery power. Besides, these batteries have a lifespan. Some batteries may get damaged before their time depending on work conditions and how they have been maintained, including their charging cycles.

Understanding the root causes of battery failure will help you prevent future issues and ensure you get the most out of your cordless drill. Below are some of the potential reasons for a dead cordless drill battery.

  • Chemical degradation- Inside your cordless drill battery pack are lithium-ion cells. Over numerous charge and discharge cycles, the chemical composition of these cells gradually deteriorates. This chemical degradation is a natural and primary reason for battery failure.
  • Overcharging- Leaving your battery on the charger for extended periods can lead to overcharging. This can cause the battery to overheat and damage its cells, reducing lifespan. The batteries have indicators that show when the charging is complete. Pay attention to the indicator and remove the batteries from their charging pot when fully charged.
  • Deep Discharging: Allowing your battery to discharge before recharging can be harmful. Deep discharging can lead to irreversible damage to the battery’s cells and a rapid deterioration in performance.
  • Exposure to Heat: Excessive heat is a battery’s worst enemy. High temperatures, whether from operating the drill in a hot environment or storing it in direct sunlight, can accelerate the degradation of the battery cells and cause death of the cells.
  • Physical Damage: Dropping or subjecting your cordless drill to impacts can damage the battery pack. Physical harm can lead to internal shorts or ruptured cells, rendering the battery unusable.
  • Age: As batteries age, their capacity and performance naturally decline. After a certain number of charge cycles (typically several hundred), a battery will no longer hold a sufficient charge for practical use.
  • Lack of maintenance: Neglecting essential battery maintenance, such as cleaning the contacts and ensuring proper storage, can lead to premature battery failure. Also, if you store your cordless drill batteries for extended periods without a partial charge, they can enter a deep discharge state, reducing longevity.

Now that we have explored the potential causes of dead batteries, let’s discuss how to jumpstart a cordless drill battery.

How to Jumpstart a Cordless Drill Battery

When you’re in the middle of a project, and your cordless drill battery decides to call it quits, it can be a frustrating experience. But fear not, as there are ways to jumpstart a seemingly lifeless battery.

Jumpstarting a cordless drill battery involves giving it a quick boost to kickstart the charging process. This can be a lifesaver when you need your drill urgently. Below is an illustration of the jumpstarting cordless drill battery process and methods.

Step 1: Choose an appropriate method.

Depending on the tools and equipment you have at your disposal, you can choose from three methods: the Car Battery Method, the Another Charged Tool Battery Method, or another fully charged cordless drill battery.

Step 2: Safety

Before attempting these methods, ensure your safety goggles and gloves are on. Safety should always come first when working with power tools and batteries.

Once you have worn protective safety gear, follow the steps below on each method to jumpstart your cordless drill battery.

Below is a step-wise process for every method.

A. The Car Battery Method

  • The method uses a car battery charger to revive your dead cordless drill battery. Start by connecting the car charger’s positive and negative terminals to the corresponding terminals on your dead cordless drill battery. Set the car charger to not more than 20 amps and allow the battery to charge for 5 to 6 seconds. Ensure you have not overcharged, as this can cause further damage to the battery. This will aim to boost the battery.
  • After the quick boost to the battery, insert the dead cordless battery into your tool’s charger and allow it to charge for about one hour, guaranteeing it reaches its adequate charge level for use, and then test the battery on your cordless drill. This process is always the most effective method for jumpstarting a cordless drill battery.
  • Remember, if your cordless drill battery does not take charge after jumpstarting with the car battery, you can repeat the jumpstarting one more time, leave the battery connected for between 10 and 12 seconds, and try charging it again. It is time to replace your battery if it still does not charge.

B. Tool Battery Method

  • This method requires the assembly of certain materials to work. For instance, you must have two short, well-insulated wires with appropriate gauges to handle the current.
  • Besides, you will need a fully charged battery that you will use to jumpstart the dead one. The two batteries should be set side by side.
  • Connect one wire between the positive terminal of a fully charged, similar kind of battery and the positive terminal of the dead cordless drill battery. Repeat the process for the negative terminals, ensuring a secure connection. Wait for about five minutes or more to allow the dead battery to receive some charge from the healthy one. The process helps transfer power from the live battery to the dead one.
  • Afterward, place the partially revived battery into the charging cavity of your wireless power drill. If the battery begins receiving a charge, then your jumpstart process worked. You should then leave the battery in the charger for about 60 minutes or until it is fully charged.
  • However, if your battery cannot receive the charge, you can try jumpstarting it again, this start letting the charges flow for about 10 to 12 seconds before you disconnect the live battery. If this does not work again, chances are that your battery is beyond salvage and needs a replacement.

The video shows how to Jumpstart dead lithium ion cordless drill battery

How to Fix a Cordless Drill Battery That Doesn’t Hold a Charge

If your cordless drill battery struggles to hold a charge, it can be a natural productivity killer. But before you rush out to buy a new battery, there are methods to revive and potentially fix your existing one.

When your cordless drill battery no longer retains a charge, it’s often due to one of two issues: the battery itself is no longer capable of holding a charge, or there’s a problem with the charger. It’s crucial to determine the root cause before attempting any fixes.

Determine the Issue.

First, you need to determine whether the issue lies with the battery or the charger. This step is crucial to avoid unnecessary expenses on replacement parts.

Then, depending on the issue you’ve identified, you can choose from three methods: the Charge Test for Drill Batteries, using a Multimeter to Test Your Cordless Drill Battery, or Reconditioning Your Cordless Drill Battery.

Let’s explore the different methods

1. Charge Test for Drill Batteries

In this method, you need to first assemble the tools including another battery that you know is functional and a charger that you trust. Insert the functional battery into the charger and ensure it charges correctly. If the charger works as expected, move on to the next step. If not, the charger might be the issue, and you should consider replacing it.

If you have realized the charger is not the problem, test the battery. Insert the problematic cordless drill battery into the charger. If it fails to charge or charges for only a short time, it clearly indicates that the battery is the culprit and needs replacement.

2. Use a Multimeter

You can also use a multimeter to test your cordless drill battery. Set your multimeter to the DC voltage setting and connect the multimeter’s positive probe to the positive terminal of the battery and the negative probe to the negative terminal.

Check the voltage reading. If it’s significantly lower than the battery’s rated voltage, it indicates that your battery isn’t holding a charge and should be replaced.

3. Recondition the Battery

Insert the cordless drill battery into your drill and use it until it’s completely discharged. Ensure the drill stops due to the low battery. Allow the battery to cool down and rest for at least 15 minutes. Then, place the discharged battery into the charger and charge it fully. Repeat this process of discharging and recharging at least three times. This can help recondition the battery and improve its charge-holding capacity

While these methods can potentially extend the life of your cordless drill battery, it’s essential to understand that they may not always work, especially if the battery is significantly degraded. If none of these methods provide a satisfactory solution, it may be time to invest in a new battery to ensure your cordless drill remains a reliable tool for your projects.

How to Repair Your Cordless Drill Battery

When your cordless drill battery experiences persistent issues, and the usual fixes don’t seem to do the trick, it might be time to consider a more advanced approach—repairing the battery itself.

Repairing a cordless drill battery involves opening the battery pack, identifying the problem components, and replacing them with new ones. This method can be more cost-effective than buying a brand-new battery. However, it’s important to note that not all batteries are easily repairable, and this process requires a certain level of technical skill.

Let’s explore the different steps into repairing the cordless drill battery.

Diagnose the Problem

Before attempting any repairs, you need to identify the specific issue with your battery. Common problems include damaged cells, faulty connections, or a worn-out protective circuit.

The process requires the assembly of certain tools such as solder, soldering iron, replacement battery cells, and an appropriate screwdriver to open the battery pack.

One you have all these tools, follow the below process.

Step 1: Safety

Ensure you are working in a well-ventilated area with good lighting. Put on safety goggles and gloves to protect your eyes and hands during the repair process. Your workshop or work area should be well-ventilated as batteries have certain emissions that can be dangerous when inhaled, causing respiratory or breathing difficulties.

Step 2: Disassembly

Use the appropriate screwdrivers to open the battery pack of your cordless drill carefully. Be cautious not to damage the pack or strip any screws. Ensure you have effectively stored the screws as you will need them during the reassembly.

Step 3: Determine the Faulty Components

Inspect the interior of the battery pack for any visible damage, such as leaking or swollen cells, corroded terminals, or damaged connections. These are the components you’ll need to address.

Step 4: Replace Faulty Cells

If you find damaged or swollen battery cells, carefully desolder them from the pack. Be sure to observe proper safety precautions when handling damaged cells.

Replace the faulty cells with new, identical cells. Ensure the replacement cells have the same voltage and capacity as the original ones.

Solder the new cells into place, ensuring secure and proper connections. Be cautious not to overheat the cells during soldering, as this can damage them.

Step 5: Repair connections

Examine the connections within the battery pack for loose or damaged wires. Re-solder any loose wires and repair any damaged connections.

Step 6: Reassemble the Battery Pack

Carefully reassemble the battery pack, ensuring that all components are in their proper places and securely fastened.

Step 7: Testing

Place the repaired battery into the charger and check if it charges correctly. Ensure that the battery is charged and operates your cordless drill as expected.

Dispose of any damaged or leaking cells following your local regulations for hazardous waste disposal.

Remember, it is essential to remember that repairing a cordless drill battery requires a certain level of technical expertise, and inherent risks are involved. If you’re not confident in your ability to safely complete the repair, or if the battery is severely damaged, it’s advisable to seek the assistance of a professional technician or consider replacing the battery altogether.

How long does it take to charge a cordless Drill Battery?

A cordless drill battery can take up to 15 minutes to 5 hours to gain a full charge. How long the battery will take to a full charge will vary depending on the battery capacity, charging conditions, and charging technology. Also, if you are using a fast charger, the charging time may be reduced.

What are some common problems with cordless drill batteries?

  • Battery Won’t Charge: If your cordless drill battery doesn’t charge, your charger may be faulty or having dead battery. Use a multimeter to determine if your charger is working properly. This is the same problem as with the battery that won’t hold charge. A multimeter can help you determine whether your battery holds charge or not. For instance, you can charge the battery to full charge and measure the voltage. Use the battery for 3 to 5 minutes and test it again and determine the charge used against the expected time.
  • Overheating: Overheating is another common problem with cordless drill batteries. However, overheating always occur when you use the drill for an extended period or if you overcharge the battery. Batteries have indicators that show when they are fully charged. Pay attention to the indicators and immediately disconnects the battery from the charger when it is fully charged.
  • Corrosion: Another significant problem with the batteries is corrosion, especially with the battery terminals. Corrosion happens when metal particles from other materials come into contact with your battery terminals, causing rust buildup of rust or corrosion on them.

Can you jumpstart a car using a cordless drill battery?

Yes, it is possible to jumpstart a car using a cordless drill battery. However, it is essential to note that not all cordless drill batteries are compatible with all vehicles.


In the article, we’ve unraveled the mysteries of cordless drill battery issues. From recognizing the signs of a dead battery to exploring the causes behind their demise, we’ve delved into practical solutions.

Whether jumpstarting your battery for a quick fix or addressing issues with a thorough repair, you now have the tools to keep your cordless drill powering through your projects.

Don’t let a lifeless battery slow you down; instead, take charge and revive your devices confidently. With the right know-how and a touch of DIY spirit, you’ll never be caught powerless again.

Happy drilling!

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