How Long Do Dewalt Batteries Last? Ultimate Guide

Battery-powered and cordless power tools are popular due to their low-cost efficiency. Dewalt is one of the market leaders, with a range of more than 200 Dewalt lithium-ion battery packs and similar battery technology to power various devices.

The development of Dewalt cordless tools was a big changer for devoted enthusiasts. It avoids the need for extension cables, and there’s no need for big generators or hefty compressors, along with all the pipes that come with them. 

You don’t need to be concerned about stumbling over a cord and being injured, or worse, spoiling your cut. Since the upcoming power tools are highly effective, it’s reasonable to pair them with a larger capacity battery. 

But how long do Dewalt batteries last? Our article will discuss everything you need to know about these batteries.

How Long Do Dewalt Batteries Last?

DEWALT 20V MAX Battery, Lithium Ion, 4-Ah & 2-Ah, 4-Pack (DCB3244)

Dewalt has produced the best battery configuration for various power tools throughout the years. Most of their cordless equipment is powered by three voltage batteries: 20 volts, 60 volts, and 120 volts. 

Moving from nickel-cadmium to lithium-ion as an energy storage medium increases performance and run times to the point where “cutting the cord” has become a feasible alternative for many professional applications. 

Various factors determine the battery’s life. User behavior, ambient storage temperatures, storage habits, and capacity are all aspects to consider. 

The Dewalt 18V batteries, If looked after correctly, should last anywhere from 2-3 years. If a battery pack’s charge capacity falls below a specific threshold, it’ll stop charging altogether. This indicates that the battery has reached the end of its useful life. However, certain dead batteries can be resurrected.

You’ll want to keep your batteries out of direct sunlight, as heat is Li-Ion batteries’ biggest enemy. Battery storage can play an important role in its life cycle. You can expect them to last considerably longer if you take good care of them.

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Tips For Ensuring Battery Life

Here are a few tips for maintaining and extending your Dewalt battery’s life.

Maintain a Full Charge

When it comes to batteries, people assume that they need to be drained before charging. However, this isn’t the case at all. Running it down might harm the battery in the long run. We recommend that you stop to charge whenever you notice a significant drop in the power of your tool. 

A safety circuit incorporated into a lithium-ion battery opens if the battery is drained below 2.5 volts per cell, and the battery seems to be dead. The original charger will no longer be functional. Only battery analyzers with the turbo feature can recharge the battery. 

Also, don’t recharge highly drained lithium-ion batteries if stored in that state for several months for safety concerns. Be sure to charge your cordless tool’s battery completely to increase the lifespan of the battery.

Allow Minor Discharges But Refrain From Complete Discharges 

Li-ion batteries, unlike NiCad batteries, don’t have battery memory. This eliminates the need for deep-discharge cycles. Partial-discharge cycles are healthier for the cordless tool battery.

One exception exists. Li-ion batteries should be allowed to drain every 30 charges. Continuous partial discharges cause a phenomenon known as digital memory, which reduces the device’s power gauge accuracy. Allow the battery to drain to the cut-off point before charging it. That’ll adjust the power meter. 

Keep at Room Temperature 

This corresponds to a temperature range of 68 to 77 degrees Fahrenheit. A full charge and exposure to high temperatures are the worst things that can happen to a lithium-ion battery.

A chemical reaction occurs when batteries are charged and discharged. In high or colder temperatures, the chemical process is disrupted, resulting in a loss of run-time. When it comes to lowering the life of lithium batteries, heat is the most crucial issue. 

For any rechargeable battery, if you charge the battery at a cool temperature, it’ll last the longest.

Extend The Life of Your Battery

Here are a few techniques to extend the life cycle of your battery:

  • When the battery is not in use, it’ll discharge. Once you notice a difference in power from the tool, remove the battery. 
  • Leave the battery cool and dry for at least 2 hours after removing it from the charger. 
  • Place the battery in the charger overnight to ensure that each cell receives a full charge (a minimum of 8 hours at room temperature).

Things to Consider When Buying Dewalt Batteries

When it comes to Dewalt replacement batteries, there are a few things to keep in mind:


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Dewalt provides various voltages, and most tools require a specific voltage, although some batteries with variable voltages are acceptable. The three primary voltages are 20, 40, and 60. 

Dewalt equipment and batteries have utilized various voltages in the past, and some of these batteries are still in use. However, they’ve limited applications and may become outdated in the future.


The amp-hour (Ah) of a battery shows its capacity, with lesser capacity batteries having an Ah around 2.0Ah and higher capacity batteries having an Ah around 7.0 or 8.0. Think about the scale of the jobs you’ll be working on, especially when it comes to larger construction.

You might want to invest a little extra money on a battery that lasts a long time so you know you’ll have enough time to complete the work.


When utilizing a Dewalt tool, it’s best to keep a backup battery fully charged at all times. Since a battery might take many hours to charge completely, quitting work early could mean having to wait until the next day to resume it. Furthermore, if you own several Dewalt tools, you’ll need a battery on hand to work on large jobs.

Final Thoughts

How long do Dewalt batteries last?

Dewalt batteries have a similar reputation to Dewalt equipment and power tools. Their tools and batteries are acquiring prominence, thanks to the launch of the FlexVolt platform. Regardless of how durable they are, the batteries take a decent amount of time to charge and function for a long time over their 3-year projected lifespan. 

If you take good care of your Dewalt batteries, you’re sure to reap benefits in the long run.

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