If you have a DeWalt power tool or are considering purchasing one, you should know that these tools are widely regarded as some of the best in the industry at an affordable price point. When it comes to quality and reliability, consumers love DeWalt tools. One of the best features is their well-made and dependable batteries, but you might be wondering: How many hours does a DeWalt 20V battery last?

DeWalt 20V batteries can last between 30 minutes and 4 hours, depending on the battery type, the tool used, and the work being done. Before purchasing a DeWalt battery, you should do your research as to the type and size to find out exactly how many hours it is going to last after being fully charged. 

In this article, we will learn everything there is to know about DeWalt 20V batteries, including the various options and how many hours each of them will last, as well as the types of batteries DeWalt offers so you can feel confident making the best possible battery purchase. 

What Types of Batteries Does DeWalt Offer?

Before we dig into the many specific DeWalt batteries and how many hours they will last, it’s first important to understand that there are two distinct types of DeWalt batteries: lithium and NiCd. 

Lithium-ion batteries are smaller, safer, and have a longer life than NiCd batteries, and for those reasons, DeWalt is slowly changing over all of its batteries to lithium. However, some of their batteries are still Nickel-cadmium, or NiCd, so it is vital that you understand what kind of battery you are purchasing. 

How Many Hours Do DeWalt 20V Batteries Last?

As you now know, DeWalt offers two types of batteries, lithium and NiCd; however, within these two categories, there are several 20V battery models, and they each have different run times. 

In this section, we have created a table with the various DeWalt batteries so you can find out how long the one you purchased or are going to purchase will last with a full charge. 

ProductMedium-Duty Run Time 
20V MAX 1.5Ah Compact Battery27 Minutes
20V MAX 1.7 Ah DEWALT POWERSTACK™ Compact Battery39 Minutes
20V MAX 2.0Ah Battery43 Minutes
20V MAX 3Ah Battery56 Minutes
20V MAX 4Ah Lithium Ion Battery Pack1 Hour 19 Minutes
20V MAX 5Ah Battery1 Hour 39 Minutes
20V MAX 6Ah Battery 2 Hours 6 Minutes
20V MAX 8Ah Battery 2 Hours 38 Minutes
20V/60V MAX 9.0Ah Battery3 Hours 8 Minutes
20V MAX 10.0Ah Lithium Ion Battery3 Hours 31 Minutes 

As you can see, there is quite a large variety of how many hours a DeWalt 20V battery lasts depending on the actual battery model, so it is vital that you purchase the correct battery for your needs. 

It is also important to understand that DeWalt batteries charge quickly, and you can expect a fully charged battery within only 60 minutes. So if you do opt for one of the batteries with a lower run-time, you can essentially continuously work as long as you always have the spare battery on charge ready to go. 

What is the Longest Lasting DeWalt Battery?

If run time is important to you and you want to opt for the DeWalt 20V battery that will last the longest before needing to be charged, the 20V MAX 10.0Ah Lithium Ion Battery is certainly the way to go. 

This battery is certainly one of the most expensive options, but it has fantastic features, and of course, will last for hours, if that is what you want from your battery. 

How Do You Know if You Should Replace Your DeWalt Battery?

No matter which DeWalt 20V battery you opt for, you will quickly get to know it and understand how long it will last, depending on the job you’re doing and the tool you are using. 

Every battery, even if you take great care of it, will start to lose a bit of its run time over time. If your DeWalt 20V battery starts taking longer than 60 minutes to fully charge, or if its run time gets down to half of what it could originally do, it’s probably time to purchase a new battery. 

Unfortunately, DeWalt’s batteries are not included in the company’s three-year warranty on all tools, so you will have to pay out of pocket when it comes time to buy a new battery.

The Bottom Line

So, how many hours does a DeWalt 20V battery last? Well, it really depends on the model. 

Most DeWalt 20V batteries can last anywhere from 30 minutes to 3.5 hours, but how long they last will also depend on the tool you are using and the job you’re doing. 

Luckily, DeWalt batteries recharge quickly, within 60 minutes, so even if you are doing some heavy-duty work that wears out your battery quickly, as long as you have a spare battery on charge, you should be able to keep working continuously.