Best Cordless Angle Grinder (2026)
Five cordless angle grinders for cutting and grinding metal, compared by voltage, disc size, speed, battery and warranty.
On this page
Top picks at a glance
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- 1
Best OverallAiderar ML-A0059.5/10View on Amazon - 2
Best KitRhovixStar CN-21V9.5/10View on Amazon - 3
Best for M18 OwnersMilwaukee 2880-209.5/10View on Amazon
A rusted exhaust bolt will not turn, and the wrench has no room to swing under the car. A cordless angle grinder slips into that gap, its disc biting through the bolt shank while the rest of the exhaust stays put. That cut is the job the best cordless angle grinder exists for: a battery tool that cuts and grinds metal where a corded tool cannot go.
This guide compares five cordless angle grinders by voltage, disc size, speed, battery and warranty, using only what each listing states.
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Quick picks
- Best Overall Aiderar ML-A005: Bare tool for DeWalt 20V Max with 3 speeds, 2 metal guards and a 2 year warranty. Check price on Amazon
- Best Kit RhovixStar CN-21V: 21V kit with 4 speeds up to 9000 RPM, 2 4.0Ah batteries and a fast charger. Check price on Amazon
- Best for M18 Owners Milwaukee 2880-20: M18 Fuel brushless grinder with an electronic clutch and anti-vibration handle. Check price on Amazon
Picks for the garage
TEENO Brushless Cordless Angle Grinder 3"
A cordless 3 inch mini angle grinder with a 16.8V brushless motor at 500W and 19,500 RPM, with 2 batteries.
Pros
- 16.8V brushless motor at 500W with 19,500 RPM
- 3 inch discs with a shorter gear head for awkward corners
- 2 batteries at 2.0Ah each with an LED battery display
- 6 discs, a hard case and gloves in the kit
Cons
- Smaller 3 inch disc size than the corded examples
- No weight is stated in the listing
- No warranty term is stated in the listing
- Battery power needs charging between jobs
Aiderar 4-1/2" Cordless Angle Grinder Tool
A bare-tool 4-1/2 in. grinder for DeWalt 20V Max batteries, with a brushless motor, 3 speeds, 2 metal safety guards and a 2 year warranty.
Pros
- 2 year warranty
- 2 metal safety guards, standard and half
- 3 speeds for grinding, rust removal and cutting
- Fits DeWalt 20V Max batteries, 4.0Ah or higher recommended
Cons
- Battery and charger not included
- Not compatible with DCB6XX 20V/60V Max batteries
- No RPM stated on the listing
- Third-party tool, not a DeWalt grinder
Milwaukee 2880-20 M18 Fuel Brushless Lithium-Ion
A brushless M18 Fuel 4-1/2 in. / 5 in. grinder with an electronic clutch for kickback protection, overload protection and an anti-vibration side handle.
Pros
- Electronic clutch for kickback protection
- Overload protection to maximize motor life
- Anti-vibration side handle
- Compatible with all M18 batteries
Cons
- Tool only, no battery included
- No warranty term stated, only Manufacturer Warranty
- 4.98875 lb, the heaviest here
- No speed range stated
Cordless Angle Grinder 3/8"-16-21V Brushless Motor
A 21V brushless grinder kit with 4 speeds up to 9000 RPM, 2 4.0Ah batteries, a fast charger and a full set of wheels.
Pros
- 2 4.0Ah batteries and a fast charger included
- 4 speeds up to 9000 RPM
- Overload and overheat protection
- Under 4 lb, compact for overhead work
Cons
- 3/8-16 spindle, unlike standard 4-1/2 in grinders
- No warranty term stated
- One wheel guard in the kit
- No disc size stated
DEWALT 20V MAX* Angle Grinder Tool Cordless
20V MAX cordless brushless 4.5-inch angle grinder with paddle switch, kickback brake and 3-year limited warranty, bare tool.
Pros
- Kickback brake stops wheel in 2 sec
- Brushless motor, no brush changes
- Two-stage trigger plus E-switch protection
- 3-year limited warranty
Cons
- Bare tool: no battery or charger
- No runtime figures stated
- 3450 RPM is modest
- 4.5-inch wheels only
Compared on paper
| Model | Shop Score | Voltage | Disc size | Speed | Battery | Warranty |
|---|---|---|---|---|---|---|
| Aiderar ML-A005 | 9.5/10 | 20V Max | 4-1/2 in | 3 speeds | Not included (tool only) | 2 years |
| Milwaukee 2880-20 | 9.5/10 | M18 | 4-1/2 / 5 in | Not stated | Not included (tool only) | Not stated |
| RhovixStar CN-21V | 9.5/10 | 21V | Not stated (3/8-16 spindle) | Up to 9000 RPM, 4 speeds | 2x 4.0Ah included | Not stated |
| DEWALT DCG413B | 9.4/10 | 20V Max | 4-1/2 in | Not stated | Not included (tool only) | Not stated |
| TEENO 3-Inch Mini | 9.6/10 | 16.8V | 3 in | 19500 RPM | 2x 2.0Ah included | Not stated |
Specifications are manufacturer rated, as published on each listing and collected 11 November 2026. Where a listing contradicts itself, both figures are shown.
How the points were given
Each grinder earns an HQ Score from performance, build, value, safety and warranty, with the weights published on the How We Pick page. None states a safety listing, so all score zero on safety. One states a 2 year warranty term; the rest state no term.
| Product | Shop Score | Perf. /35 | Build /25 | Value /25 | Safety /10 | Warranty /5 |
|---|---|---|---|---|---|---|
| Aiderar ML-A005 | 9.5 | 29 | 21 | 21 | 0 | 3 |
| Milwaukee 2880-20 | 9.5 | 32 | 22 | 19 | 0 | 0 |
| RhovixStar CN-21V | 9.5 | 30 | 20 | 21 | 0 | 0 |
Scores run from 9.2 to 9.8: each product’s point total is placed on that range, so more points always means a higher score.
What the listings tell you
Five cordless angle grinder listings went into this guide. Three give full data: a Milwaukee M18 Fuel bare tool, an Aiderar bare tool for DeWalt 20V Max, and a RhovixStar 21V kit with 2 4.0Ah batteries. Two give title data only: a DEWALT 20V Max bare tool and a TEENO 16.8V mini tool. One states a 2 year warranty, and none states a safety listing.
Buying guide: choosing the best cordless angle grinder
Voltage and battery
A 21V kit with 2 4.0Ah batteries arrives ready to cut. A 20V Max or M18 bare tool needs batteries the buyer already owns. The TEENO 16.8V mini tool includes 2 2.0Ah batteries in a hard case.
Disc size and spindle
A 4-1/2 in. disc is the standard size here, and the Milwaukee also takes a 5 in. disc. The RhovixStar uses a 3/8-16 spindle, unlike the standard 4-1/2 in. grinders, so its accessory choice is narrower. The TEENO is a 3 in. mini tool for light cutting.
Speed
The RhovixStar lists 4 speeds up to 9000 RPM, and the TEENO lists 19500 RPM. The Milwaukee and Aiderar listings state no speed range.
Guards and switches
The Aiderar includes 2 metal safety guards, a standard guard for grinding and a half-guard for cutting, plus a lock-off button and soft start. The Milwaukee has a no-lock paddle switch and an electronic clutch for kickback protection. The DEWALT lists a paddle switch and kickback brake in its title.
What the listings do not state
Two listings give title data only, so their speed, warranty and guard details are not stated. The Milwaukee warranty description reads Manufacturer Warranty, with no term. No listing states a safety listing.
Use rated jack stands on solid ground, wear eye protection with power and air tools, keep fuel-burning equipment out of a closed garage, and follow the manual for every tool. Read our Safety Disclaimer.
Garage Fit Check
- Measure the shelf: the Milwaukee measures 13.0 by 8.5 by 3.5 in, and the RhovixStar measures 14.76 by 5.51 by 4.3 in.
- A kit with 2 batteries and a charger needs a charging spot; a bare tool needs batteries the buyer already owns.
- Check the battery fit first: the Aiderar fits DeWalt 20V Max batteries but not DCB6XX 20V/60V Max batteries.
- Match the guard to the job: the Aiderar includes a standard guard for grinding and a half-guard for cutting.
- Store the discs with the tool: the RhovixStar kit includes 2 cutting wheels, 2 sanding wheels and a grinding wheel.
FAQ: garage tools
What size disc does a cordless angle grinder take?
A 4-1/2 in. disc is the standard size here; the Milwaukee also takes a 5 in. disc, and the TEENO is a 3 in. mini tool. Check the spindle too: the RhovixStar uses a 3/8-16 spindle, while the Milwaukee and Aiderar use a 5/8-11 spindle.
Do cordless angle grinders come with batteries?
The RhovixStar kit includes 2 4.0Ah batteries and a fast charger, and the TEENO includes 2 2.0Ah batteries. The Milwaukee, Aiderar and DEWALT listings are tool only, so the battery is separate.
What is kickback protection on an angle grinder?
The Milwaukee lists an electronic clutch for kickback protection, and the DEWALT title lists a kickback brake. Both are stated features that act when the disc binds.
Can a cordless angle grinder cut metal?
The listings state metal cutting as a use: the RhovixStar kit includes cutting wheels for metal cutting, and the Aiderar lists metal cutting on its top speed setting. The TEENO discs are stated for metal and wood cutting and grinding.
Which battery fits the Aiderar grinder?
The Aiderar fits DeWalt 20V Max batteries, and the listing recommends a 4.0Ah or higher capacity battery. It does not fit DCB6XX 20V/60V Max batteries.
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