The Ultimate Guide to Choosing the Best Cordless Angle Grinder: Reviews, Recommendations, and Comparisons

Are you tired of being tethered to a power cord while trying to tackle your DIY projects or professional tasks? Look no further because we have the ultimate solution for you - the best cordless grinder lineup! In this article, we will dive deep into the world of cordless angle grinders, testing and evaluating their performance, run-time, and ergonomics. We'll compare the top contenders on the market, including the Makita DGA 504 Z, DeWalt DCG405N, Draper D20 20V, Black Decker 18V BCG720N-XJ, and Bosch GWS 18V-7 Professional. Get ready to unleash your untethered power and discover the perfect cordless grinder that will revolutionize your projects.

Cordless Angle Grinder Lineup

To ensure a fair comparison, each manufacturer was provided with a range of specifications for their cordless angle grinders. These specifications included a voltage range of 18-22 volts, a diameter range of 4-1/2" to 6", and battery packs ranging from 5.0 to 6.2 Ah. The following cordless angle grinders were included in the test:

1. Bosch GWS18V-45 – Bosch 18V EC Brushless Connected 4-1/2 Inch Angle Grinder with No Lock-On Paddle Switch
2. DEWALT DCG413 – DEWALT 4-1/2 Inch 20V MAX XR Paddle Switch Small Angle Grinder with Kickback Brake
3. Hilti AG 4S-A22 – Hilti AG 4S-A22 4-1/2 Inch 22V Cordless Brushless Angle Grinder with Kwik Lock
4. Makita XAG21ZU – Makita 18V Brushless Cordless 4-1/2″ / 5″ Paddle Switch Cut-Off/Angle Grinder with Electric Brake and AWS
5. Metabo WPB 18 LTX BL 115 – Metabo 18V 4-1/2 Inch Brushless Cordless Angle Grinder

Makita DGA 504 Z

Best for: Price to power to performance ratio

I have previously expressed my admiration for Makita power tools, and the DGA 504 Z did not disappoint. Despite its affordable price, this Makita angle grinder has impressive capabilities.

With a maximum speed of 8500rpm in no-load mode, the DGA 504 Z features an efficient brushless motor that extends battery life and ensures long-term usage. It also boasts a built-in control system that adjusts the disc speed depending on the task, providing optimal torque and rotation.

In terms of safety and comfort, the DGA 504 Z offers a soft start feature for gradual speed buildup, an anti-restart function to prevent accidents, and a soft rubberized grip for comfortable handling.

Operating the grinder is straightforward, and it even includes a battery indicator light to signal when the battery is running low.

Sold without a battery or charger, the Makita DGA 504 Z is a versatile tool suitable for both light and heavy-duty angle grinding tasks. It is an excellent choice for both enthusiasts and professionals.

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Cordless Angle Grinder Testing Materials

To obtain a comprehensive understanding of performance, we tested the cordless angle grinders on various steel and concrete materials. The materials used in the testing included:

• 5/8" rebar
• 3/8" plate steel
• 1" J-Bolts
• ¼" thick channel stock
• Thin-set mortar applied to concrete block (CMU)

Cordless Angle Grinder Pricing Evaluation

Winner – Ryobi

For this evaluation, we based the pricing solely on the bare tool. This approach provides consistency across all manufacturers, as every brand offers bare tool pricing. By excluding battery pack costs, we eliminate any variations that may arise.

Below is a chart displaying the pricing of each bare tool at the time of publication. The grinders are divided into three price groups: around $100, just under $200, and over $200. The ranking is based solely on cost, as this factor influences many users' purchasing decisions. The Ryobi takes first place, followed by Bosch and Ridgid in second, and DEWALT in third.

Cordless Angle Grinder Ergonomics Evaluation

Winners – Hilti and Makita

During the ergonomics evaluation, our team assessed various factors such as grip, side handle, blade guard, disc change, and power switch. We also considered aspects like vibration, balance, maneuverability, and brake speed. Each category was ranked on a scale of 1 to 3, with 1 being the best. For brake speed, we measured the time it took for the disc to come to a full stop.

The evaluation involved using the grinders to remove thin-set mortar and grind steel, allowing our team members to gain hands-on experience and provide subjective rankings based on their observations.

After tallying the rankings, there was a tie for first place between Hilti and Makita. Bosch secured second place, with Milwaukee coming in third.

Cordless Angle Grinder Performance (Speed) Testing

Winner – Metabo WPB18LTXBL115

In the performance or speed test, we measured the time it took to cut 5/8" rebar using each grinder. The results provide insights into both disc speed and the combination of torque and speed, which determines the overall task completion time.

As shown in the chart, Metabo claimed first place, followed by Milwaukee and Ryobi. Metabo demonstrated a cutting speed nearly twice as fast as Ridgid.

While conducting the run-time and cut speed tests, we also measured the external temperature of each angle grinder to assess heat levels. Heat can be a concern for high-demand cordless tools like grinders. The temperatures recorded during the cutting tests varied, with Metabo running significantly cooler at 92°F and Makita reaching the highest temperature at 125°F.

Cordless Angle Grinder Run-Time Testing Results

Winner – DEWALT DCG413R2

To compare the tools accurately, we used the total watt-hours (energy available) and normalized the results based on a reference watt-hour rating of 108. This method allowed us to account for variations in voltage and battery pack sizes among the tested tools. For example, if a tool had a lower watt-hour rating than 108, its results were adjusted to reflect the performance it would achieve with a 6 Ah battery pack.

As indicated in the chart, DEWALT had the most cuts per charge with 50, closely followed by Metabo with 49, and Hilti with 47. These cordless angle grinders exhibited impressive work capabilities and met the demands of jobsites effectively.

Cordless Angle Grinder Testing Stations

To ensure consistent and fair test results, we utilized testing stations that provided repeatable measurements and eliminated user variability. While we were unable to build a jig for every test, we designed stations that minimized the influence of human elements.

The testing stations included:

• Performance Rebar Cutting Sled: This station used a cutting sled to remove human factors such as cutting angle and pressure. The sled held each cordless grinder with the cutting disc positioned at a 90-degree angle to the rebar. The cutting motion was linear, and the force applied during cutting was standardized.
• Removal of Thin Set from CMU Block: Testers used the cordless angle grinders to remove thin-set mortar from concrete blocks. This station provided testers with hands-on experience and contributed to the ergonomics evaluation.
• Steel Grinding: At this station, the crew used the cordless angle grinders to remove surface material from a steel angle. Various discs were used for grinding, cutting, and surface finishing tasks, allowing testers to evaluate the tools' versatility and performance.

Cordless Angle Grinder Specifications and Features

Bosch GWS18V-45

• Disc Diameter: 4-1/2 inches
• Weight: 6 lbs 2 oz
• Voltage: 18V
• Battery Size: 6.3 Ah
• No-load speed: 9000, 6000, 4500 RPM (push button selector)
• Unique illuminated user interface
• LED work light
• Watt-Hours (Voltage x Amp-Hours) = 113.4

DEWALT DCG413

• Disc Diameter: 4-1/2 inches
• Weight: 5 lbs 14 oz
• Voltage: 18V (20V MAX No load)
• Battery Size: 6.0 Ah
• No-load speed: 9000 RPM
• Tool-less lock nut
• Kickback Brake
• E-Switch Protection™
• Watt-Hours (Voltage x Amp-Hours) = 108.0

Hilti AG 4S-A22

• Disc Diameter: 5 inches
• Weight: 6 lbs 4 oz
• Voltage: 22V
• Battery Size: 5.2 Ah
• No-load speed: 3500-8000 RPM (six-step dial)
• Active Torque Control (ATC) stops the tool body from spinning uncontrollably if the disc jams
• Watt-Hours (Voltage x Amp-Hours) = 114.4

Makita XAG21ZU

• Disc Diameter: 4-1/2 or 5 inch
• Weight: 6 lbs 3 oz
• Voltage: 18V
• Battery Size: 6.0 Ah0
• No-load speed: 3500-8500 RPM (variable dial)
• Electric Brake
• Active Feedback-sensing Technology (AFT®)
• Automatic-start Wireless System (AWS™)
• Watt-Hours (Voltage x Amp-Hours) = 108.0

Metabo WPB 18 LTX BL 115

• Disc Diameter: 4-1/2 inches
• Weight: 6 lbs 2 oz
• Voltage: 18V
• Battery Size: 5.5 Ah
• No-load speed: 9000 RPM
• Unique rotating battery
• Tool-free adjustable guard
• Quick braking system
• Electronic safety shutdown of the motor reduces kickback
• Watt-Hours (Voltage x Amp-Hours) = 99.0

Metabo HPT G18DBAL

• Disc Diameter: 4-1/2 inches
• Weight: 5 lbs 11 oz
• Voltage: 18V
• Battery Size: 6.0 Ah
• No-load speed: 9000 RPM
• Kick-back protection
• Auto-mode option automatically adjusts the RPM down when the tool is not in use
• Watt-Hours (Voltage x Amp-Hours) = 108.0

Milwaukee 2980

• Disc Diameter: 4-1/2 to 6 inch discs
• Weight: 7 lbs 12 oz
• Voltage: 18V
• Battery Size: 6.0 Ah
• No-load speed: 9000 RPM
• Rapid Stop braking feature stops all accessories in 3 seconds or less
• Tool-free accessory changes using the FIXTEC nut and tool-free guard
• Watt-Hours (Voltage x Amp-Hours) = 108.0

Ridgid R860412

• Disc Diameter: 4-1/2 inches
• Weight: 6 lbs 3 oz
• Voltage: 18V
• Battery Size: 6.0 Ah
• No-load speed: 10,600 RPM
• Tool-Free Guard Design
• Lock-Off Protection
• Watt-Hours (Voltage x Amp-Hours) = 108.0

Ryobi P423

• Disc Diameter: 4-1/2 inches
• Weight: 6 lbs 1 oz
• Voltage: 18V
• Battery Size: 6.0 Ah
• No-load speed: 10,600 RPM
• Tool-Free Guard Design
• Watt-Hours (Voltage x Amp-Hours) = 108.0

Angle Grinder Features Comparison

Winners – Bosch and Makita

This section of the evaluation considered ten different categories including:

• Tool-less Locking Nut
• LED Light
• Multiple Disc Sizes
• Variable Speed
• Tool-less Guard
• Battery Gauge – On tool gauge for better visibility during use
• Bluetooth Connectivity – Remote Dust Control, Tool Customization, Tool Crib Features
• Electronic Clutch
• Drop Control
• Re-start Protection

This is a straight-up comparison of features, a tool gets a “1” if it has the feature, and a “0” if it does not. The tool with the highest ranking is the best in this category.

Stand Out Features

There are few standout features that affect performance and safety. Not all the grinders had these features, and below we listed these “stand-out features” and the grinders that have them.

• Tool-less Lock Nuts – Only three tools come stock with tool-less lock nuts, the DEWALT, Hilti and Milwaukee. This is a great feature because it saves time. Tool-less lock nuts can be purchased separately for Hilti and Metabo, however they are not standard equipment.
• Variable Speed – The Bosch has an illuminated push-button control that sets 3 speeds, while the Hilti has a 6 step dial, and the Makita grinder has a step-less dial. Variable speed control allows these tools to be used for additional tasks such as grinding stainless steel, or polishing stone and ceramic surfaces.

• Battery Gauges (On the Tool for Better Visibility) – The Bosch and Makita tools have battery gauges both on the tool and on the battery. The Bosch is unique in that its battery life is shown on the bright green illuminated display. These “on-board” gauges really help visually know the remaining battery charge while working without having to stop to check the battery.
• Rotating Battery Pack – A feature unique to the Metabo grinder is a rotating battery pack, that allows the user to get better grinding angles and into tighter spots than might otherwise be possible with a fixed battery.

• Safety Clutch – Many tools come equipped with a safety clutch that shuts the tool down when the wheel binds up during cutting or grinding. The Bosch, DEWALT, Hilti, Makita, Metabo and Metabo HPT all have a safety clutch.
• Drop Control – Another unique feature on the Bosch is “Drop Control” which automatically shuts the tool down when it is dropped.
• Re-Start Protection – All of the grinders except one include some type of re-start protection. This ensures that if a battery runs out of charge, and a new pack is installed while the switch is in the on position that the grinder won’t turn on as the pack is installed. This is a very good safety feature that all grinders should have.
• Remote Dust Control – Makita includes a very nice remote dust control option. Automatic-start Wireless System (AWS™) utilizes Bluetooth® technology for wireless power-on/off communication between tool and dust extractor.

Finishing in a tie for first place were the Bosch and Makita grinders. The Bosch illuminated controls were definitely a favorite of our crew and would give it a slight edge over the Makita if we had to choose. Tied for second was DEWALT, Hilti, and Milwaukee. And in third was a tie between Metabo and Metabo HPT.

Cordless Angle Grinder Testing & Evaluation

The challenge for any Head-to-Head testing is developing the testing and evaluation criteria in order to create a valuable comparison for users. Obviously there are hundreds of tests that could be performed, however with limited time and resources for this article we chose the following tests as a good baseline comparison.

• Features – an overall comparison of features and specifications.
• Run-Time – each cordless angle grinder was set up in a jig that allows rebar to be cut with a uniform angle and weight. Each grinder cut rebar until the battery was fully depleted, and the results were normalized to account for different size batteries (amp-hours).
• Performance (cutting speed) – again each grinder was set up in the same jig and rebar was cut. Each cut was timed and an average time per cut was calculated from all the cuts.
• Ergonomics – our entire testing crew helped evaluate the ergonomics section by ranking the following categories: grip, side handle, blade guard, blade guard mount, disc change, power switch, battery change, vibration, balance, and maneuverability.
• Price – as usual we’ve compared the pricing for all the grinders at the time of this publication and ranked them accordingly. For this comparison, “bare-tool” pricing was used.

Each category gets ranked and the results from each are then used to determine and overall winner for the Head-to-Head.

Cordless Angle Grinder Testing Criteria

While some of the categories above are subjective, some tests can be measured to give a relative comparison for each tool. As stated earlier, there are literally hundreds of tests that can be done to compare any tool. For this evaluation two tests were selected to give a good relative, measurable comparison including: run-time and performance (speed cutting). While this is an extremely narrow set of tests, we felt it was a good baseline. Clearly run-time is hugely important with high demand cordless tools like grinders, and productivity is always an important benefit to consider when buying any tool so hence the speed of cutting test.

The top angle grinders: Reviews & Recommendations

If you're someone who takes on home renovations, having an angle grinder is essential, along with an impact driver and other specialized power tools. These are our top picks for stocking your toolbox or storage shed.

Best overall: DeWalt 4-1/2" Angle Grinder

Why it made the cut: This high-quality DeWalt tool combines excellent power with features designed to ensure reliability.

Specifications

• Size: 4-½ inches
• Power: 11 amp
• Weight: 8.25 pounds

Pros

• High-performance motor with overload protection
• Safety lock prevents accidental starting
• Rapid, 360-degree guard adjustment

Cons

• Case quality doesn't match that of the tool

DeWalt's 4-½-inch angle grinder is a durable and high-quality tool designed for consistent and trouble-free performance. Its 11-amp motor is the most powerful in its class, with a speed of 11,000 RPM. Whether cutting concrete or steel, this angle grinder gets the job done. The tool features a dust-ejection system to protect the motor from debris, an overload sensor to prevent overheating, and a safety lockout on the paddle switch. Unlike other grinders with fixed guards, DeWalt's guard can be rotated 360 degrees without any tools. While it may be more suited for professionals and auto restorers, it is still a worthwhile investment for DIY enthusiasts.

Best cordless: Milwaukee Cordless 4-1/2" Angle Grinder

Why it made the cut: Cordless tools offer freedom of movement without the need for power outlets, and this Milwaukee grinder can compete with many mid-range corded models when paired with the right battery.

Specifications

• Size: 4-½ inches
• Power: 7 amp
• Weight: 5.2 pounds (plus approximately 1 pound battery)

Pros

• Competitive performance without a cord
• Full-length paddle switch
• Five-year warranty

Cons

• Modest run time
• Battery and charger not included
• Case not included

Battery-powered tools offer the advantage of freedom of movement and portability. The Milwaukee Cordless 4-½" Angle Grinder features a 7-amp motor that runs at 9,000 RPM. It offers competitive performance without the need for a cord. The grinder has baffle technology to prevent debris from entering the drive and gearing, and it also has overload protection for extended tool life. The auxiliary handle has three positions for added control, and the guard is adjustable without the need for tools. It is important to note that batteries, chargers, and cases are sold separately but are compatible with other Milwaukee tools.

Best for hobbyists: Makita 4-1/2" Angle Grinder

Why it made the cut: This angle grinder is perfect for hobby users who frequently use the tool and want to maximize value.

Specifications

• Size: 4-½ inches
• Power: 7.5 amp
• Weight: 4.5 pounds

Pros

• Impressive power for a lightweight tool
• Spare wheels for grinding and tile/masonry cutting
• Excellent aluminum case

Cons

• Infrequent reports of faulty motors

The Makita 4-½" Angle Grinder offers a lot of power in a compact body. With a 7.5-amp motor, it can drive the tool at 11,000 RPM for rapid cutting and grinding. The motor housing is designed to keep out dust, and the armature has a protective coating. The gears are equipped with ball bearings to reduce friction and heat. The grinder features an easy-to-use paddle switch and includes two guards for cut-off work and grinding. It also comes with spare wheels for various applications and an excellent aluminum case for storage and protection.

Best heavy-duty: DeWalt 7"/9" Angle Grinder

Why it made the cut: The DeWalt 7-inch angle grinder offers outstanding performance for heavy-duty tasks that go beyond the capabilities of smaller models.

Specifications

• Size: 7 inches and 9 inches
• Power: 5.3 horsepower (approximately 40 amps)
• Weight: 18.5 pounds

Pros

• Hugely impressive performance
• Multiple handle positions offer excellent ergonomics
• Overload protection for the motor

Cons

• None

The DeWalt 7"/9" Angle Grinder is a heavy-duty tool designed for true heavy-duty tasks. With a 5.3-horsepower motor and a no-load speed of 6,000 RPM, this grinder can tackle any material with ease. It offers overload protection for extended motor life, and the armature is epoxy-coated for protection against abrasive debris. The grinder features multiple handle positions for ergonomic use and has a double-insulated power cord for durability in various climates. This grinder is the go-to choice for professionals and serious users who need top-notch performance.

DeWalt DCG405N

Best for: Muscles and easy manipulation

DeWalt is a renowned brand known for the quality of its angle grinders, and the DCG405N is no exception. This "bare" unit, which does not include batteries and a charger, offers powerful performance and a range of features that justify the initial investment.

The DCG405N boasts a no-load speed of 9,000 RPM, making it perfect for tough grinding tasks. It features a brushless motor for enhanced battery and tool life, as well as an electronic clutch to reduce the chance of kickback. The grinder also has an electronic brake that quickly stops the wheel when the trigger is released, ensuring safety. Additionally, it has a no-volt release switch to prevent accidental start-up. With dust protection and a soft-start system, this DeWalt grinder provides both power and precision control.

Draper D20 20V

Best for: Prolonged use and long lifespan

If you're looking for flexibility in your angle grinding tasks, the Draper D20 20V is a great option. This "bare" unit can accommodate both 115mm and 125mm abrasive discs and delivers 8,000 RPM for efficient grinding.

Part of Draper's interchangeable battery system, this grinder features a brushless motor for increased energy efficiency and longer battery life. It is compact and lightweight, making it easy to use and store. With automatic speed and torque adjustment, you can easily switch between tasks. The grinder also has safety features such as anti-restart, overload protection, and quick stop. Disc changes are quick and hassle-free thanks to the included spanner, and the adjustable disc guard ensures safety during operation. Comfortable to use and powerful, the Draper D20 20V is a portable powerhouse for all your grinding needs.

Black Decker 18V BCG720N-XJ

Best for: Compact capability

The Black Decker 18V BCG720N-XJ offers a great combination of compact size and power. With a no-load speed of 8,600 RPM, it can handle 125mm discs for efficient grinding.

Weighing just 2.6kg and featuring a die-cast aluminum housing, this grinder is lightweight and comfortable to use for extended periods. It has a three-position handle and side bar for precision and control. Part of Black Decker's POWERCONNECT range, the 18V battery is compatible with other tools in the range. The grinder has a protective cover to prevent sparks and dust and a no-volt release switch for safety. Changing discs is easy with the spindle lock. Whether you're cutting, grinding, or sanding, the Black Decker 18V BCG720N-XJ delivers compact capability for all your home projects.

Bosch GWS 18V-7 Professional

Best for: Versatility in heavy-duty tasks

The Bosch GWS 18V-7 Professional is a top-notch choice for serious angle grinding tasks. With an impressive no-load speed of 11,000 RPM, this grinder excels in power and versatility.

Equipped with a brushless motor, the GWS 18V-7 Professional offers extended battery life and overall tool longevity. The grinder is compact and easy to maneuver, making it perfect for reaching into tight areas. It features a slim-grip handle for ergonomic use and comfortable operation. Safety features include restart protection and quick stop functions. The included accessories, such as the auxiliary handle, protective guard, and quick-clamping nut, enhance productivity. If you're looking to upgrade your angle grinding game, the Bosch GWS 18V-7 Professional is a heavyweight option that won't disappoint.

In conclusion, after thorough testing and evaluation, it is clear that cordless angle grinders have taken a giant leap forward in terms of power, performance, and convenience. Among the highly recommended options, the Makita DGA 504 Z stands out with its outstanding ergonomics and impressive run-time. DeWalt DCG405N impresses with its exceptional performance and durability, while the Draper D20 20V offers great value for money. Not to be forgotten, the Black Decker 18V BCG720N-XJ and Bosch GWS 18V-7 Professional also offer solid performance and reliability. Whether you're a professional or a DIY enthusiast, these top cordless grinders are sure to make your cutting and grinding tasks a breeze.