Brushless vs Brushed

1. The Short Answer

Buy brushless if you use a drill most weeks, work through long sessions, drive large fasteners, or want a tool that will still be good in a decade. Buy brushed if the drill lives in a cupboard and comes out for flat-pack furniture and picture hooks a few times a year.

A useful reframing: if the premium is the difference between a brushless bare tool and a brushed kit with two batteries and a charger, the batteries are often the better purchase. Runtime you can carry beats efficiency you cannot.

2. What Brushes Actually Do

An electric motor spins because a magnetic field keeps moving ahead of the rotor, pulling it round. To keep that field rotating, the current through the windings has to be switched repeatedly and in the right sequence. The two motor types differ only in how that switching happens.

A brushed motor does it mechanically. Two carbon blocks — the brushes — are held by springs against a segmented copper ring called the commutator on the spinning shaft. As the shaft turns, the segments pass under the brushes and the current is redirected automatically. It is elegant, cheap, has been in use for well over a century, and works without any electronics at all.

The cost of that elegance is contact. The brushes rub continuously against a rotating part, which produces friction, heat, sparking, carbon dust and wear. The brushes are consumables: they get shorter every hour the tool runs, and when they are gone the motor stops.

A brushless motor moves the switching into a small electronic controller. Sensors or the motor's own electrical behaviour tell the controller where the rotor is, and it energises the windings in sequence at exactly the right moments. Nothing touches, nothing rubs, nothing wears. The magnets move to the rotor and the windings sit in the housing, which also means the heat is generated where it is easier to shed.

3. The Side-by-Side

The last row is the only genuine point in the brushed column, and it is a small one. A brushed motor's failure is gradual, predictable and sometimes repairable; a brushless controller either works or does not. In practice controllers rarely fail, but when they do the tool is finished.

4. The Runtime Difference

Of all the claimed benefits, this is the one you feel on an ordinary day. Energy lost to brush friction and resistance is energy that never reaches the chuck, and eliminating it means a battery does more work before it needs charging.

The improvement is not fixed. On very light work — driving small screws into softwood — the difference is modest, because the motor is barely loaded and losses are small in absolute terms. On heavy work, where the motor is drawing serious current, brushless pulls decisively ahead: the efficiency gap widens under load precisely because friction and heat scale with the work being done.

The practical effect is that a brushless drill with a compact battery often outlasts a brushed drill with a large one, and it does so while being lighter to hold overhead. Anyone who has spent a day fixing plasterboard to a ceiling will recognise why that combination matters more than a specification sheet suggests.

One nuance worth knowing when comparing tools: runtime claims on packaging usually come from a specific test, such as screws driven per charge, and are not comparable between brands. Judge runtime by watt-hours in the battery and the motor type, not by a headline figure. Our cordless drill reviews compare like for like on the same batteries.

5. What the Electronics Add

Because a brushless motor requires a controller anyway, manufacturers get a computer in the tool essentially for free, and the features that follow are often more valuable than the efficiency.

Speed regulation. The controller can hold a set speed as resistance changes, so the drill does not bog down entering a knot or slow as a hole saw bites. A brushed motor simply slows when loaded, and you compensate with the trigger.

Electronic clutch and overload protection. The controller monitors current and can cut power when it spikes, protecting both the tool and your wrist. Some drills offer anti-kickback features that stop the motor when they detect the tool rotating suddenly, which on a large auger bit is a genuinely useful safety function.

Modes and precision. Self-tapping screw modes, sensitive low-speed control for starting a fastener, and consistent behaviour at the very bottom of the trigger travel all come from electronic control. Brushed drills are noticeably grabbier at low speed.

Thermal management. The controller watches temperature and throttles before damage occurs rather than letting the motor cook. Combined with a cooler-running design, this is why brushless tools tolerate sustained heavy work that would leave a brushed drill smelling of hot varnish.

6. Lifespan and Repair

Brushes wear at a rate set by hours of use and how hard the tool is worked. A professional using a drill daily might wear a set out in a few years; a homeowner might never get close in the tool's entire life. That is why longevity claims sound compelling in a shop and prove irrelevant in a cupboard.

When brushes do wear, what happens next depends on the tool. Better corded tools and some professional cordless models have accessible brush caps and replacement carbons that cost very little. Most consumer cordless drills seal the motor, so worn brushes mean a dead tool — and since a new drill costs less than the labour to open one, that is usually the end of it.

A brushless motor removes that whole failure mode. In practice, brushless drills are retired because the batteries are obsolete, the chuck has worn loose, or the platform has moved on — rarely because the motor gave up. If you are the sort of buyer who keeps tools for fifteen years, that is a real argument.

It also affects resale and hand-me-down value. A brushless tool from a major platform holds value noticeably better second-hand, because buyers know the motor is not a wearing part. If you tend to upgrade and sell, some of the premium comes back.

7. Who Actually Needs It

The pattern is duty cycle. Brushless advantages are proportional to how much work passes through the tool, so a professional recovers the premium within months while an occasional user may never recover it at all. There is no shame in the second row of that table; a brushed drill from a reputable brand is a good tool.

One more consideration that often decides it: the battery platform. Committing to a brand's battery system matters far more over a decade than the motor in your first tool, which is why our guides to drills for home use and Milwaukee versus DeWalt spend as much time on platforms as on the tools themselves.

8. Beyond Drills

The same trade applies across cordless tools, but the size of the benefit varies a great deal with how hard each tool works its motor — which is useful to know when deciding where to spend.

Tools that run continuously under heavy load benefit most: circular saws, angle grinders, reciprocating saws, leaf blowers and lawn mowers. Here brushless is close to essential, because sustained current is exactly the condition in which brush friction and heat dominate, and a brushed motor spends its life on the edge of overheating.

Impact drivers benefit strongly too, though for a slightly different reason. They work in intense bursts, and electronic control gives them precision modes that brushed models cannot offer — a topic we cover in our comparison of drills and impact drivers.

Tools that barely load their motors gain least: work lights, small vacuums, glue guns, inflators and the like. Paying a premium for brushless on a tool that spends its life at ten per cent of capacity is money that would do more good almost anywhere else in the kit.