Why Is My DeWalt Cordless Drill Smoking? Causes and Fixes

Quick answer: Why is my DeWalt cordless drill smoking? First, find where the smoke starts. Smoke from the hole is usually friction from a dull bit. Smoke from the motor vents means an overloaded or worn motor. Smoke from the battery is a fire risk: stop, get the pack away from anything flammable if it’s safe, and call 911 if it keeps smoking.

Smoke is never something to drill through. Let go of the trigger first. Then figure out where it came from, because the fix for a hot bit and the fix for a failing battery are completely different.

I’ll lean on DeWalt’s own manual for the 20V MAX DCD771 compact drill/driver throughout. Where I give an opinion, I’ll say so.

Here’s how I’d work through it, one step at a time. Most DeWalt cordless drills share the same warnings, but check your model’s manual for its specific limits.

Why Is My DeWalt Cordless Drill Smoking? Start With Where

This is the decision that matters most. Take a breath and look before you touch anything, because when you know the source, the next step is obvious.

Where you see smoke	Most likely cause	What to do now
From the hole or the bit tip	Friction: dull bit, wrong bit, too much speed in metal	Stop, let the bit cool, fix the bit or technique
From the motor vents, with a burning smell	Overloaded or stalled motor, blocked vents, worn brushes	Release the trigger, let it cool, then inspect
From the battery pack or where it joins the tool	Battery fault or short circuit	Treat as a fire risk; follow the battery steps below
From the charger	Charger or pack fault	Unplug the charger if safe; don’t reuse it

Why It Happens

1. Bit friction. A dull or wrong bit rubs instead of cutting, and the wood or metal scorches. DeWalt’s first drilling rule is “use sharp drill bits only.”
2. An overloaded or stalled motor. Big bits, hole saws or high-torque jobs can stall the drill. DeWalt says a stall “is usually because it is being overloaded or improperly used.”
3. Blocked air vents. Dust packed into the vents traps heat inside the motor housing.
4. Worn brushes or internal wear. The DCD771 has a brushed motor, and DeWalt lists brush inspection and replacement as service-center work.
5. A damaged or shorted battery pack. Drops, punctures, water or loose metal touching the terminals can all damage a lithium-ion pack.

How to Fix It

If the Smoke Comes From the Hole

This is the most common and least worrying cause. It’s the material burning, not the drill.

1. Check the bit. A dull twist bit or a bit made for wood being used in metal will smoke.
2. Use the right gear. DeWalt’s two-speed drills have speed 1 for high torque and speed 2 for higher speed. Bigger bits and metal usually want the slower, high-torque gear.
3. Ease off the pressure. DeWalt says to press hard enough to keep the bit biting, “but do not push hard enough to stall the motor or deflect the bit.”
4. Back the bit out often to clear chips, and keep the motor running as you pull it out of the hole, which DeWalt says helps prevent jamming.

Watch your fingers afterward. DeWalt warns that accessories can get hot, and suggests gloves for heat-producing work like drilling metal.

If the Smoke Comes From the Motor Vents

Release the trigger immediately. Remove the battery and let the drill cool completely before you do anything else.

Then ask what it was doing when it smoked. DeWalt lists maximum recommended capacities for the DCD771 of 1 inch (25 mm) in wood and 1/2 inch (13 mm) in steel. A 2-inch hole saw or a big spade bit through a beam is beyond that, and the motor pays for it.

The stall rule is worth memorizing. When the drill stalls, DeWalt says to release the trigger, pull the bit out and find the cause. It adds, in capital letters, not to pulse the trigger on and off to restart a stalled drill, because “this can damage the drill.” That’s exactly how a lot of motors get cooked.

Next, clean the vents. DeWalt says to blow dirt and dust out of all air vents with clean, dry air at least once a week, wearing ANSI Z87.1 eye protection while you do it. Don’t use solvents on the housing; DeWalt says a cloth dampened with water and mild soap only.

If it still smokes, smells burnt or sparks heavily through the vents under a light load, my guess would be worn brushes or a tired motor. DeWalt says repairs, including brush inspection and replacement, should be done by a DeWalt factory service center, an authorized service center or other qualified service personnel. I wouldn’t keep using it until then.

If the Smoke Comes From the Battery

Treat this as an emergency. Don’t wait to see what happens.

New York State’s Division of Homeland Security and Emergency Services lists the warning signs of a failing lithium-ion battery: extreme heat, swelling or bulging, hissing or popping sounds, an unusual odor, and smoke. Its advice if you notice them:

1. Stop using the device and turn it off immediately.
2. Unplug it from any power source.
3. If it’s safe, move it away from anything flammable using tongs or gloves.
4. Leave the area.

If the device is smoking, the same agency says to get outside, stay outside, and call 911.

Once it’s cold and safe, don’t reuse the pack. DeWalt’s manual says never to open a battery pack, not to charge a cracked or damaged one, and not to use a pack or charger that has been dropped, crushed, pierced or damaged in any way. It says damaged packs should go back to a service center for recycling.

Prevent Battery Trouble

A few habits from the same manual cut the risk a lot:

• Don’t store loose packs where nails, screws, keys or coins can touch the terminals. DeWalt warns that a short across the terminals can start a fire.
• Don’t store the tool or packs where temperatures reach 105°F (40°C) or more, like a metal shed or a hot truck in summer.
• Charge only DeWalt packs in DeWalt chargers, and don’t charge below 40°F or above 105°F.
• Never tape the trigger on, and don’t store a pack in a tool with the trigger locked on.

Warm Is Normal; Smoke Is Not

It helps to know what DeWalt considers normal, so you don’t panic over the wrong thing.

The manual says the charger and battery pack “may become warm to the touch while charging,” and calls that normal. It also says the DCB107 and DCB112 chargers have a hot/cold delay: if the pack is too hot, the charger waits until it cools before charging, with a yellow light showing during the delay. A hot pack after hard drilling is expected.

I wouldn’t fight the delay by chilling the pack in a freezer or fridge. Just set it somewhere shaded and let it rest.

DeWalt’s charging notes are worth following, too. It says packs last longest when charged at 65°F to 75°F, never below 40°F or above 105°F, and that a cold pack charges at about half the rate of a warm one. Keep chargers out of hot metal sheds and uninsulated trailers.

What’s not normal: smoke, a melted smell, bulging, hissing, popping, or a pack too hot to hold. Any of those, and I’d stop right there.

If a damaged pack leaks onto your skin, DeWalt says to wash with mild soap and water. If it gets in your eyes, rinse with water for 15 minutes or until irritation ends, and get medical help if needed.

When to Call a Technician

Contact DeWalt (1-800-4-DEWALT, printed in its manuals) or an authorized service center if:

• The motor smoked or smelled burnt after a normal, light job
• You see heavy sparking through the vents or hear grinding
• The drill runs weakly or stops after it cools down
• Anything about the battery or charger looks damaged, swollen or melted

Call 911 if a battery keeps smoking, catches fire, or you can’t move it safely. A drill is replaceable. Your house isn’t.

One honest note from me: a smoking motor on a cheap, older drill sometimes isn’t worth a repair bill. That’s your call, but please don’t keep running a tool that smoked just to finish the job. Swap to another drill, or borrow one, and deal with the broken one properly afterward.

If you also own Milwaukee tools, our guide on how to fix a Milwaukee impact driver explains what its battery lights mean. Browse more help in drills and drivers.

Frequently Asked Questions

Is it normal for a cordless drill to smoke?

No. A little smoke from the hole when drilling hardwood or metal can come from friction, but smoke from the tool or battery isn’t normal. Stop and find the source.

Can I keep using my DeWalt drill after it smoked?

Only if the smoke came from the bit and the drill runs normally once it cools. If the motor or battery smoked, stop using it and contact DeWalt service.

Why does my drill smell like burning?

Usually an overloaded motor, a stalled bit, blocked vents or worn brushes. Let it cool, clean the vents, use a sharp bit in the right gear, and have it serviced if the smell returns.

What should I do if my DeWalt battery is smoking?

Stop, turn the tool off and, if safe, move the pack away from anything flammable with tongs or gloves. If it’s still smoking, get outside and call 911.

Why does my drill smoke when drilling metal?

Usually friction. A dull bit, too much speed or too little pressure makes the bit rub and heat up. Use a sharp metal bit in the slower, high-torque gear, and wear gloves, since DeWalt warns bits get hot drilling metal.

Last updated: November 10, 2026. Sources: DeWalt DCD771 drill/driver instruction manual (PDF) and NY DHSES: lithium-ion battery fire warning signs.