Skip to content
Subscribe Now Get a 6% Off | Free Shipping On Order Over $30
Subscribe Now Get a 6% Off | Free Shipping On Order Over $30

Repurposing and Reusing Old Power Tool Batteries

Are you tired of your power tool batteries dying out and becoming useless? Or are you interested in what to do with old batteries that have lost their ability to hold a charge? At Vanon Batteries, we provide high-quality replacement batteries for power tools at affordable prices. In this article, we'll discuss two main topics related to old power tool batteries: "What can I do with old cordless tool batteries?" and "How to re-use power tool batteries for other purposes?" We'll also answer some common questions related to replacement batteries for power tools.

battery for power cable

What can I do with old cordless tool batteries?

It's important to dispose of old batteries properly, as they are potentially hazardous to the environment. However, before you throw them away, there are some ways to repurpose them. Here are some ideas:

Powering outdoor lighting: Old batteries can be used to power outdoor lighting, such as solar-powered garden lights. Simply connect the battery to the light's solar panel and watch it light up.

Portable power bank: Use your old batteries to create a portable power bank. All you need is a battery holder, a USB port, and some wiring. You can even add a voltage regulator to ensure your devices are well-protected from power surges.

DIY projects: There are countless DIY projects that can make use of old batteries. From building a remote-controlled car to powering a homemade robot, the possibilities are endless.

How to re-use power tool batteries for other purposes?

Reusing old batteries not only saves you money, but it's also an environmentally friendly option. Here are some ways you can re-use your old power tool batteries:

Cordless fans: You can use old power tool batteries to power cordless fans. They're perfect for outdoor use, such as camping or picnics.

Bluetooth speakers: Old batteries can be used to power Bluetooth speakers. Simply connect the battery to the speaker's power source and enjoy your favorite tunes.

Backup power source: Old batteries can be used as backup power sources for emergencies, such as power outages. Keep them fully powered and ready to use when needed.

Common Q&A:

Should I always have the batteries fully charged?

No, it's not recommended to keep power tool batteries fully charged. It's best to charge the battery to around 80% and then remove it from the charger to extend its lifespan. Overcharging a battery can increase the chance of overheat and shorten its lifespan.

Is it okay to leave power tool batteries on the charger?

It's generally safe to leave power tool batteries on the charger, as most chargers are designed to stop charging when it's fully charged. However, it's recommended to check the manufacturer's instructions for specific charging recommendations.

How to read the date code on a power tool battery?

Most batteries have a date code stamped on them, usually on the bottom. The code typically consists of a letter and a number. The letter tells the month (A=January, B=February, etc.) and the number represents the year (9=2009, 0=2010, etc.).

How is the battery percentage calculated?

The battery percentage is calculated based on the voltage of the battery. Different batteries have different voltage ranges, so it's important to check the manufacturer's specifications. Some batteries have a LED battery indicator on the body, for example, these batteries for Milwaukee 18V tools have 5 different battery indicator lights to tell you how much battery is left. 

Is a 4Ah battery sufficient for an electric drill?

Dewalt battery replacement

A 4Ah battery can be sufficient for an electric drill, depending on the drill's power requirements and the user's needs. For light to medium-duty drilling tasks, a 4Ah battery may provide enough power and run time. However, for heavy-duty drilling or prolonged use, a higher capacity battery may be needed. Vanon provide replacement batteries for major branded power tools up to 9.0Ah, with a more affordable price.

What does 5.0 Amp-hour mean on a battery?

The Ah (amp-hour) rating on a battery refers to its capacity or how long the battery can last on a single charge. A 5.0 Ah battery can deliver a certain amount of current for 5 hours, or 1 amp of current for 5 hours, or 2.5 amps for 2 hours. Generally speaking, the higher the Amp-hour rating, the longer the battery can last.

Can Milwaukee M18 batteries be interchangeable?

Milwaukee replacement battery

Milwaukee M18 batteries are interchangeable within the M18 lineup of power tools. This means that any M18 battery, regardless of its Ah rating or tool type, can be used with any M18 tool. However, M18 batteries cannot be used with Milwaukee M12 tools, as they require a different battery platform.

Can I use a 20V lithium ion battery in an 18V tool?

No, 20V lithium-ion batteries cannot be used in an 18V tool. While both battery types are rechargeable and use similar technology, they have different voltage ratings and are not interchangeable. Attempting to use a 20V battery in an 18V tool could damage both the battery and the tool.

How to revive a lithium-ion drill battery?

Lithium-ion drill batteries can be revived by performing a process called "reconditioning." This involves fully discharging the battery, then charging it fully and repeating the cycle a few times. Another method is to freeze the battery for a few hours, then let it thaw and recharge it fully. However, not all these methods work for all batteries, and some batteries may need to be replaced.

What happens when a cordless drill battery gets wet?

When a cordless drill battery gets wet, there is a major risk of damaging the battery itself and reduce its overall lifespan. Water can increase corrosion and damage to the battery's internal components, which can lead to decreased performance and even complete failure. If a battery gets wet, it should be removed from the tool immediately and allowed to dry completely before attempting to use again.


In conclusion, old replacement batteries for power tools can be repurposed in many ways, listed one or two, such as powering other devices or as backup power sources. With proper care and maintenance, power tool batteries can provide reliable and long-lasting performance. 

Understanding battery capacity, compatibility, and safety measures can help you make the most from your power tool batteries. By following the tips in the article, users can save money, reduce waste, and extend the lifespan of their power tool batteries.

If you need backup replacement batteries with a fair price, Vanon Batteries always got you covered too!

Take Advantage of more Capacity For Your Power Tools!