DeWalt 20V Battery USB Adapter Review

Reviewed by

Seb and Michelle

We've tested over 6,500 products in the last 5 years – collaborating with over 4,000 brands and bringing our style of reviews to multiple platforms. Every video, every review and every post has started with a video we shot ourselves after testing these products. More about me →

Dead Phone, Running DeWalt Battery

I don’t know about you, but I’ve got a bunch of these DeWalt 20V batteries sitting around and they are great if you’ve got the tools that go with them, but between jobs, they just sit there. That’s what made this adapter so interesting when I came across it. You clip it onto the bottom of the battery, press one button, and all of a sudden you’ve got USB-A and USB-C ports right there in your hand. The battery that was on my chainsaw yesterday is now charging my phone. That’s a pretty wild transformation for such a small piece of ABS plastic. You can check current pricing and availability for the DeWalt 20V USB adapter 2-pack right here on Amazon.

The thing weighs only 3.52 ounces, so the adapter itself adds basically nothing to whatever battery you’re already carrying. And if you’ve got multiple batteries, the 2-pack means you can dedicate one adapter per battery and leave them clipped on. No hunting around for it. No fumbling with cables before you can even get started.

Two Ports, One Button, Zero Extra Purchases

The setup is about as simple as it gets. Slide the adapter onto any DeWalt 20V lithium-ion battery the same way you’d seat a tool, it clicks in solid. Press the button on the adapter and it powers on. From there, you’ve got a USB-C port and a USB-A port ready to go. The 20V battery feeds right through it.

Same color too. I love that. They actually thought of that. The adapter is yellow and black, matching DeWalt’s standard colorway. When everything on your belt or in your bag is already branded DeWalt, having a matching accessory that also actually functions is a nice touch.

The unit has built-in overload protection, short-circuit protection, under-voltage protection, and over-current protection. So it’s not just a raw dump of power from a lithium-ion battery through two ports, there’s actual safety circuitry in there. The adapter also runs slightly warm during use, which the manufacturer flags as normal. It’s not alarming, just worth knowing if you’re tucking it into a bag while it’s plugged in.

Phone Charging. Right Away.

I pressed the button, clipped on a battery that had just come off my blower, and plugged my phone in via USB-C. And that was it. Charging started immediately. “Oh, beauty right away.” That’s exactly what came out of my mouth. The battery I tested with was a 20V 5Ah unit, a big one, and that power just flows straight through the adapter without any fuss.

The charging speed is noticeably solid. For context, this is a 20V lithium-ion tool battery. You’re not drawing from a small cell pack like a typical pocket power bank. The capacity and discharge rate on a battery like a 5Ah DeWalt unit blows most portable chargers out of the water. The fun thing is that if you’ve got multiple batteries, you’ve got multiple chargers. Leave one adapter per battery and you’ve got a setup that’s ready to go whenever you pull a battery off a tool.

It’s also worth saying that this isn’t designed for fast charging or high-power devices. The manufacturer is upfront about that, it’s meant for phones, small devices, low-power draws. Don’t expect to run a laptop off this. But for keeping your phone alive on a job site or during a camping trip? It handles that without any drama.

Ten Minutes to Find Something to Plug In

Here’s the catch that got me mid-test. You press the button to power on the adapter, and the clock starts immediately. If nothing is plugged into the USB ports within 10 minutes, the adapter shuts itself off automatically. So you’ve got 10 minutes to find something to plug in before it kills the output.

That’s not the end of the world, you just press the button again, but it’s a bit annoying if you power it on and then get distracted or have to dig around for your cable. On a job site, that kind of friction is real. You’ve got your hands full, you press the button thinking you’ll plug in shortly, and by the time you’re ready the thing has shut off. Press. Plug. That’s the sequence you need to get into. Invert it and you’re pressing twice.

Also, the adapter does run warm. Not hot, but warm enough to notice if you’re holding the battery and adapter combo for a while. That’s normal behavior for this type of device, but if you’re stuffing it into a tight tool bag while it’s in use, give it some airflow.

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DeWalt 20V USB Battery Adapter

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Campers, Contractors, and Anyone With a Battery Drawer

If you’re a camper, this is a no-brainer add-on. You’re probably already throwing DeWalt batteries in your vehicle for a cordless drill or a lantern. This adapter weighs basically nothing and gives you phone charging from the same battery you were already packing. No extra power bank. No extra charger. It already fits in your ecosystem.

Same goes for hikers who are already carrying cordless tool batteries for some reason, or more realistically, outdoor workers who live off job sites. If you’re framing, doing electrical work, or running a crew on a site without easy access to outlets, charging your phone mid-day becomes a real logistical problem. This solves it with gear you already own.

But, even if you’re not in any of those categories, if you’ve just got a drawer full of DeWalt batteries at home from various tools over the years, this is a clever way to get backup power out of them. Emergency use case, power outage, long weekend project. The batteries were sitting there anyway. Might as well make them more useful.

The 2-pack format is smart here. One lives on a big battery in the garage for the workbench. The other stays clipped to a battery in the truck. Or you leave one in your hiking pack. The fact that it comes as a pair at this price point means you can spread them around without having to think about it.

Before You Clip It On

A few things that’ll save you a moment of confusion when you unbox this.

No battery comes with it. That’s obvious to most DeWalt owners, but if you’re buying this as a gift for someone who’s just getting into the DeWalt ecosystem, flag it. The adapter is useless without a 20V lithium-ion battery. Don’t assume the recipient has one.

The order of operations matters. Press the button first, then plug in your device. You’ve got that 10-minute window. If you clip the adapter on and set it down thinking you’ll grab your phone in a minute, the adapter may have already cycled off by the time you’re ready. Press. Plug. Repeat if needed.

Charging performance also depends on the cable and device you’re using, not just the adapter. The product info is clear on that. Use a good cable. A worn-out USB-C cable won’t get the most out of this setup. If you’ve got a fresh cable you trust, that’s where to start.

And a reminder that this isn’t a fast-charger. It’s designed for slow, steady, low-power use, the kind of charging that keeps your phone from dying over the course of a workday, not the kind that takes it from 10% to 80% in 20 minutes. Set those expectations upfront and you’ll be happy with it. Try to run it like a high-speed charger and you’ll be disappointed. It’s not built for that.

If you want to check the current price and grab the 2-pack, the DeWalt 20V USB adapter is available on Amazon here.

Frequently Asked Questions

Does this adapter work with DeWalt FLEXVOLT batteries?

No, the adapter is compatible with DeWalt 20V lithium-ion batteries only. FLEXVOLT batteries operate at a different voltage (60V max in tool mode), so they’re not the right fit for this adapter. Stick with standard 20V packs for reliable, safe operation.

Can I charge a tablet or laptop with this?

Tablets might work slowly, but this isn’t designed for it. The manufacturer is clear that this is for low-power, temporary use, think phones and small devices. Laptops are out of scope entirely. Don’t expect it to handle anything that pulls serious wattage.

Will the adapter drain the battery down to zero if I leave it on?

The under-voltage protection circuit is designed to cut off before the battery is fully depleted, that’s one of the four safety features built in. So it won’t dead-kill your battery. That said, you don’t want to be running this off a battery you need back in a tool an hour later, so manage your battery inventory accordingly.

Do the USB cables come included?

No. The 2-pack includes only the adapters, no cables, no batteries. You’ll need your own USB-C or USB-A cable. The charging performance also varies depending on the cable quality you use, so don’t reach for a beat-up old cable and wonder why it’s slow.

Is it safe to use both USB ports at the same time?

Both ports are available simultaneously, and the built-in overload and over-current protection should keep things from going sideways. That said, remember that this is rated for low-power use, running two devices at once is fine for phones, but don’t stack high-draw devices on both ports and expect peak results from either.

What’s the warranty situation?

Warranty terms aren’t stated in the product listing, so check the Amazon product page directly for the return window and any seller-provided coverage. Amazon’s standard return policy typically applies to third-party accessories like this, but confirm before ordering if that matters to your decision.

Learn more

DeWalt 20V USB Battery Adapter

Get the best price on Amazon →

This post contains affiliate links. I may earn a commission at no extra cost to you.

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About the reviewer

Seb and Michelle

We've tested over 6,500 products in the last 5 years - collaborating with over 4,000 brands and bringing our style of reviews to multiple platforms. Every video, every review and every post has started with a video we shot ourselves after testing these products.

Read more about me →