Five new cordless angle grinders announced for a 22-volt system show where the category is heading. Four of the five target metal grinding and cutting, and the most powerful model is built for concrete correction and rebar cutting. The lineup spans three power classes: 1,000 watts, 1,500 watts, and 2,200 watts of corded-equivalent output, and every model runs on the same battery platform.
Buyers who know what to look for in cordless angle grinders weigh four variables before price: power class, safety features, runtime, and disc compatibility. The same checklist applies whether the tool runs on 18 volts or 22 volts, and it narrows a crowded shelf down to one or two real candidates.
Disc Size and Power Class: Sizing the Tool to the Job
Disc size sets the tool class. A 4.5-inch or 5-inch grinder is the compact workhorse for metal cutting and light grinding. A 6-inch model adds reach and power for heavier stock. A 7-inch class tool, the 2,200-watt model in this lineup, handles concrete correction and rebar cutting that smaller discs cannot do in a single pass. Buy the disc class that matches the thickest material you cut on a regular schedule.
Metal Grinding and Cutting
For metal work, the 1,000-watt class is enough for most cutting and grinding: slicing angle iron, cleaning welds, and cutting bolts. Slim grips and a dead man’s switch make the compact models comfortable for the long sessions that grinding demands. The 1,500-watt model sits between the classes and earns its place on crews that bounce between light cutting and extended stock removal.
Concrete Correction and Rebar Work
Concrete correction and rebar cutting need the top power class. The 2,200-watt model pairs a rotating handle with a fast brake, so the tool can be repositioned between cuts and stopped quickly when the disc binds. Diamond discs handle the concrete, while abrasive wheels cut the rebar, and the higher power keeps both moving through the work instead of stalling.
For tight spots, compact cordless cut-off tools and angle grinders trade a little capacity for reach, and the 1,000-watt class covers most of that ground. A compact body fits between studs and under cabinets where a full-size grinder will not go.
| Power class | Disc size | Typical jobs | Notable features |
|---|---|---|---|
| 1,000 W | 4.5 to 5 in | Metal cutting, light grinding | Slim grip, dead man’s switch, auto restart |
| 1,500 W | 6 in | Heavier stock, extended grinding | Sensor-activated switch, spindle lock |
| 2,200 W | 7 in class | Concrete correction, rebar cutting | Rotating handle, brake under 3 seconds |
Corded-Equivalent Power: Comparing Motor Output
Corded-equivalent is the shorthand for how a brushless motor performs against a corded tool of the same wattage. The 1,000-watt claim means the cordless tool sustains output comparable to a 1,000-watt corded grinder for the duration of a cut, not just at startup. Sustained output is what matters, and it depends on the motor, the electronics, and the battery working together.
The Milwaukee M18 FUEL angle grinders show the same tiering, with dual-trigger models adding a second switch on the side handle, and the newest 6-inch models stopping the wheel in under 2 seconds. Platform comparisons like this are useful because they separate marketing numbers from measured behavior.
Why Power Class Matters More Than Peak Watts
A grinder that hits high watts for a second and then sags will stall on a long cut. The rated class describes the sustainable output, so a 1,500-watt model outperforms a 1,000-watt model on thick stock even when both claim the same peak. Match the class to the thickest material you cut regularly, not the rare job that happens twice a year.
Safety Systems: Switches, Brakes, and Detection
Cordless grinders concentrate safety in four systems: the switch, the restart behavior, the brake, and grip detection. A dead man’s switch kills power when the hand lets go. Auto restart prevents the tool from spinning up on its own after a power interruption. Braking stops the disc quickly when the trigger releases. The newest models add dual-hand detection, a feature that reads how the operator is holding the tool.
Dead Man’s Switch and Auto Restart
The dead man’s switch on the compact models is a slide or paddle that must be held, so a dropped tool stops itself. Auto restart is a productivity feature that resumes grinding without a manual reset after the battery drops and reconnects, which matters when a tool stalls mid-cut on a long grinding pass. The sensor-activated dead man’s switch goes further by reading grip pressure and responding to how hard the operator is holding the handle.
Brake Speed Tradeoffs
Brake speed is a tuning decision, not a race. One maker’s newest 6-inch models stop the wheel in under 2 seconds, while the 2,200-watt model in the new lineup claims a stop in less than 3 seconds. Too fast a brake can loosen the disc, and too slow reduces the safety benefit. The right number balances stopping speed against wheel retention, and the engineers who build these tools tune it deliberately.
- Mount the disc and confirm the spindle lock engages before tightening.
- Hold the grinder with both hands and keep the guard in place.
- Squeeze the switch and let the wheel reach full speed before contact.
- Start the cut with light pressure and let the wheel do the work.
- Release the switch and let the brake stop the wheel before setting the tool down.
The braking systems that make cordless angle grinders safer for construction work reward the same attention, and a brake that stops a disc in seconds changes how quickly a stalled cut turns into a safe one.
Brushless Motors and Battery Platform Fit
Every model in the new lineup runs a brushless motor, and that choice drives the whole value proposition. Brushless motors run cooler, use less power at the same output, and last longer than brushed motors because there are no brushes to wear. The efficiency shows up as runtime, which is the real currency of a cordless tool on a site without power.
- More runtime per charge at the same output.
- Less heat in the motor housing during long cuts.
- No brush wear or commutator maintenance.
- Better low-speed torque for starting a cut without stalling.
Brushless motor technology in cordless angle grinders improves runtime per watt, and that matters most when a grinding pass runs longer than any other tool cycle on the site.
Battery Platform Fit
All five models share the 22-volt platform, so one battery and charger serve the grinder, the saw, and the drill. Buy the battery size to match the tool: a compact battery keeps the grinder light for overhead work, while a high-capacity pack extends grinding time at the cost of weight. The platform decision usually matters more than the grinder model, because the batteries outlast every tool they power.
Disc Changes, Ergonomics, and Daily Workflow
An automatic spindle lock makes disc changes tool-free: press the lock, spin the disc until it seats, and tighten with the wrench that ships with the grinder. Models with the feature cut the disc-change time to seconds, which adds up over a day of mixed cutting and grinding. The lock also makes the tool safer to service, because the spindle cannot rotate while the operator works on the wheel.
- Remove the battery before touching the disc area.
- Press the spindle lock and rotate the disc until it engages.
- Loosen the flange nut with the supplied wrench.
- Swap the disc and hand-tighten the flange nut.
- Run the grinder briefly off the work to confirm the disc runs true.
Spindle locks and electronic brakes follow the same upgrade logic as other cordless power tool upgrades, where circular saws, reciprocating saws, and angle grinders all gained the same safety-first features in sequence.
Ergonomics and Long Sessions
A rotating handle lets the operator reposition the grip as the cut direction changes, which keeps the wrist neutral on concrete work. Slim grips reduce fatigue in metal grinding, and a well-placed dead man’s switch makes the tool easier to hold for extended passes. Test the grip with the gloves you wear on site before buying, because a handle that fits a bare hand can feel wrong with work gloves on.
Matching the Grinder to the Task
The final choice comes down to the work. Metal cutting and light grinding: a 1,000-watt model with a slim grip. Heavy stock and long grinding sessions: the 1,500-watt class. Concrete correction and rebar: the 2,200-watt model with the rotating handle and brake. When the work is finishing and detail, a different tool class fits better, and the battery platform lets a crew add tools without adding chargers.
For finishing and detail work, cordless die grinders in straight versus right-angle configurations cover the jobs a large disc tool cannot reach, and they share the same battery platform. A grinder that matches the task, the gloves, and the battery bag is the one that gets used.
- Confirm the power class covers the thickest material you cut.
- Verify the brake and dead man’s switch before the first job.
- Match disc size and guard to the application.
- Buy batteries to suit runtime, not just price.
- Test the grip and switch with the gloves you wear on site.