how to revive cordless drill batteries

Are you struggling to get your cordless drill up and running? Don’t worry, there are a few simple steps that can help revive the dead battery of a cordless drill. In this blog post, we’ll take you through some tips on how to diagnose the problem, charging techniques, general maintenance tips and troubleshooting advice so that even if it’s been sitting in storage for months or years – you can still bring it back to life! So whether your cordless drill batteries have died out completely or just aren’t performing as well as they used to be – read on for our expert guide on reviving them.

Table of Contents:

Diagnose the Problem

It can be frustrating when your cordless drill battery dies unexpectedly. However, before hastily purchasing a new one, it is crucial to diagnose the issue properly.

Charging Tips

If your battery isn’t holding its charge, check that it is being charged correctly. Make sure you are using the correct charger for your particular model of drill and that the voltage matches what is printed on the battery itself. It’s also worth noting that if you leave a battery in a charger for too long, this can damage it and reduce its lifespan significantly. If possible, remove it from the charger once fully charged or after no more than 24 hours of charging time has elapsed.

Battery Maintenance

To ensure the optimal functionality of your cordless drill batteries, regular maintenance is crucial. This includes cleaning any dirt or dust off with a damp cloth and making sure all connections are secure and free from corrosion – especially those between the terminals and contacts on both ends of each cell in multi-cell batteries (if applicable). Additionally, avoid exposing them to extreme temperatures, as this can cause permanent damage over time.


If you have identified that your cordless drill battery is not working, the next step is to learn about charging tips so you can get it back up and running.

Key Takeaway: To ensure your cordless drill batteries stay in good condition, it’s important to charge them correctly and maintain them regularly. This includes cleaning the battery and making sure connections are secure, avoiding extreme temperatures, and removing it from the charger after 24 hours or when fully charged.

Charging Tips

a green drilling device

Charging a cordless drill battery is an important part of keeping it in good condition and ensuring it works properly. Here are some tips to help you charge your battery safely and effectively:

1. Check the Temperature: Before charging, make sure that the temperature of both the battery and charger are within acceptable limits. If either is too hot or cold, wait until they reach room temperature before attempting to charge them.

2. Read Instructions Carefully: Always read the instructions provided with your charger carefully before plugging it in or connecting it to a power source. This will ensure that you use the correct settings for your particular model of drill battery and avoid any potential hazards associated with incorrect usage.

3. Use Only Recommended Chargers: It’s important to only use chargers specifically designed for your type of drill battery, as other types may not be compatible or safe to use with certain models or brands of batteries.

4. Charge at Low Temperatures: When possible, try to keep temperatures low while charging by avoiding direct sunlight on both the charger and battery, as well as using fans if necessary during summer months when temperatures can rise quickly indoors due to heat buildup from electronics such as computers or televisions nearby.

5. Monitor Charging Times: Make sure that you monitor how long each charge takes so that you don’t overcharge or undercharge your drill batteries – this could lead to damage which could reduce their lifespan significantly over time if done repeatedly without taking proper precautions beforehand. The recommended times vary depending on the brand but typically range between 1-4 hours per full cycle.

By following these charging tips, you can ensure your cordless drill batteries are always ready to use. Now let’s look at how to maintain them for optimal performance.

Key Takeaway: Always use recommended chargers, monitor charging times and keep temperatures low while charging to ensure your cordless drill battery is charged safely and effectively.

Battery Maintenance

a man holding a cordless drill

Battery maintenance is essential for keeping your cordless drill in top condition. Regularly cleaning the contacts and checking voltage levels can help ensure that your drill works as efficiently as possible.

Cleaning Contacts: Keeping the contacts on your battery clean is important to maintain a strong connection between the battery and charger, as well as between the battery and tool. Dirt or dust buildup can cause poor contact, which will result in reduced power output from the battery. To clean them, use a cotton swab dipped in rubbing alcohol to gently scrub away any dirt or debris that has accumulated on either side of each contact point.

Checking Voltage Levels: It’s also important to check voltage levels regularly, especially if you notice decreased performance from your drill when using it with its full charge. The average lithium-ion cordless drill should have an operating voltage of 18 volts; anything lower than this indicates a weak cell within the battery pack and means it needs replacing soon before it fails completely while in use. You can test this by using a multimeter set to measure DC voltages – simply attach one lead of the meter onto each terminal of the battery pack and read off what’s displayed on a screen (it should be around 18V). If not, then you need to replace your batteries sooner rather than later.

Proper battery maintenance is essential to extend the life of your cordless drill batteries and avoid unexpected downtime. In this next section, we’ll look at troubleshooting common issues with cordless drill batteries.

Key Takeaway: To keep your cordless drill in top condition, regularly clean the contacts with rubbing alcohol and check voltage levels using a multimeter.


Troubleshooting cordless drill batteries can be a tricky business. Fortunately, there are some common issues that you can easily fix yourself with the right tools and knowledge.


drilling wall made of wood

Corrosion is one of the most common problems with cordless drill batteries. This occurs when metal particles from other materials come into contact with your battery terminals, resulting in a buildup of rust or corrosion on them. To prevent this from happening, make sure to keep all metals away from your battery terminals and clean them regularly using a soft cloth and rubbing alcohol. If corrosion has already occurred, use an old toothbrush dipped in vinegar to scrub it off gently before wiping it down again with rubbing alcohol for extra protection against future damage.


Another issue that often arises is overcharging the battery by leaving it plugged in too long or not unplugging it after use. This can cause permanent damage to the cells inside the battery, which will result in reduced performance and shorter life expectancy for your device. To avoid this problem, always unplug your charger as soon as you’re done charging and never leave it plugged in overnight or longer than necessary while still connected to the power source. Additionally, try not to charge more than 80% capacity if possible since this will help extend its lifespan significantly without sacrificing performance levels too much either way.

Discharge Cycles

Finally, another important factor when troubleshooting cordless drill batteries is discharge cycles – meaning how many times you have discharged (used) and then recharged (refilled) the same cell before replacing it completely with a new one. Generally speaking, most modern lithium-ion batteries should last up to 500 full discharge/recharge cycles before needing replacement, but depending on usage habits, they may need changing sooner than expected, so pay close attention.

Key Takeaway: To ensure your cordless drill battery lasts, avoid corrosion by keeping metal away from terminals and clean them regularly. Don’t overcharge the battery and keep it plugged in no longer than necessary. Lastly, pay attention to discharge cycles and replace after 500 full cycles.


Reviving a dead cordless drill battery can be a daunting task, but with the right knowledge and maintenance tips, you can get your drill up and running again in no time. Diagnosing the problem is key to finding out what needs to be done to revive your cordless drill batteries. Charging tips will help ensure that your battery gets enough power for it to work properly. Battery maintenance should also be taken into consideration, as this will prolong the life of your battery. Finally, if all else fails, troubleshooting might just do the trick! With these steps in mind, you’ll have no trouble reviving those dead cordless drill batteries!

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