The Best Cordless Angle Grinders in 2021 – Top Picks & Buyer’s guide

Last Updated on October 13, 2020 by Robert L. Perkins

Angle grinders are an essential tool for various trades such as landscaping, steel, automotive, woodwork. Your workshop will remain incomplete without a good angle grinder. If you’ve been feeling tired of your electric socket by your corded angle grinder, then we’ve got a way out for you.

We’ll tell you about some of the best cordless angle grinders that are out there in the market to help you make the transition from your corded grinder to a cordless one.

If you’ve got any doubts about the advantages of a cordless grinder over a corded one, then read on and find out why you must invest in a cordless angle grinder.

Best Cordless Angle Grinders – Comparison

ImageProduct NamePrice
Makita XAG04T 18V LXT BL 4-1/2"/ 5" Cut-Off/Angle GrinderCheck Price
DEWALT DCG413B 20V MAX Brushless Cut Off Tool/Angle GrinderCheck Price
Bosch 18V Cordless Angle Grinder, 4-1/2 In. GWS18V-45Check Price
Ryobi P421 6500 RPM 4 1/2 Inch 18-Volt One+ Lithium Ion-Powered Angle GrinderCheck Price
Metabo 18V 6" Cordless Angle GrinderCheck Price

 Best Cordless Angle Grinder Reviews

Now that you know the benefits of using a cordless angle grinder, let’s find out what are some of the best ones out there.

1.  DEWALT DCG413B Cordless Angle Grinder

DEWALT DCG413B 20V MAX Brushless Cut Off Tool/Grinder

Key Features

  • Speeds: 9000 No-load RPM
  • Voltage: 18V to 20V
  • Weight: 3,75 lbs
  • Battery Size: 6.0 Ah

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The world-renowned DeWalt brings you a 4.5″ angle grinder with a brushless motor and promises to run 57% times more than the brushed one.

Because of its powerful 20V battery, it can deliver a maximum of no-load speed of 9000 RPM. A pretty sweet deal for a cordless angle grinder. With this voltage, you can accomplish most angle grinding tasks from sanding, grinding to cutting sheet, or thicker metals.

And the anti-kickback and the blade-brake features make it ideal for both professional as well as any household user for whom safety is the biggest concern when handling power tools such as an angle grinder.

These will prevent your grinder from turning on while putting in the battery and stop the wheel within seconds of turning off the grinder. This one uses a paddle switch for operation, and as soon as you release the paddle switch, the brake will be engaged.

It’s simple and easy to operate, and with it being cordless, you’ll be able to work at your desired speed, power, and accuracy. The one thing that might discourage you is that it is sold as a stand-alone grinder, which means you’ll have to buy the batteries, charger, bag, and any other attachments separately.

This will definitely increase your overall cost, but trust us, it’ll be worth it as it is one of the best angle grinders out there.

Pros
  • Brushless motor
  • Anti-kickback and Blade Brake technology
  • Powerful 20V voltage with 9000 RPM
  • Compact and lightweight
Cons
  • Battery and charger has to be bought separately

2. Makita XAG04Z Cordless Angle Grinder

Makita XAG04Z 18V LXT Lithium-Ion Brushless Cordless 4-1/2” / 5

Key Features

  • Speeds: 3500-8500 RPM
  • Voltage: 18V
  • Weight: 5.8 lbs
  • Battery Size: 6.0 Ah

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The major feature of the Makita XAG04Z is that it uses a brushless motor. Brushless motors are far superior to their brushed counterparts when it comes to performance and runtime. It is particularly useful for heavy tasks as you can put a lot more pressure on it without having to worry about the quality or accuracy of the cut.

And its 18V LXT lithium-ion battery provides sufficient power, which makes it ideal for sanding, grinding, and cutting a wide range of materials that include concrete, pipe, tile, conduit, and others and in terms of speed, Makita XAG04T’s engine can deliver 8500 RPM.

One of the best things about this grinder is its Automatic Speed Change Technology. It has the ability to adjust its speed and torque automatically for optimum performance during operation.

Coming back to the batteries, these lithium-ion batteries are among the fastest charging batteries, which means you’ll be able to work with it for longer, and the waiting period for charging is relatively much shorter.

Makita’s Star Protection technology also allows the grinder and the batteries to exchange data in real-time and keep track of conditions during operation to protect against over-discharging, overloading and overheating.

When using a power tool like an angle grinder, comfort is definitely on top of your priorities. And Makita delivers just that. The handle of this grinder can be moved from one side to the other with ease.

As if all of these weren’t enough, the grinder comes with plenty of accessories. With the angle grinder, included in the package are tool bag, side handle, and lots of other things.

Although it’s a bit pricey, when you see the newest technology features it offers you and the components you’re getting, you’ll actually be saving money if you get it.

Pros
  • Lightweight and compact
  • Automatic Speed Change Technology
  • Package includes a lot of accessories
Cons
  • expensive than most of the angle grinders out there

3.  Bosch GWS18V-45 Cordless Angle Grinder

Bosch 18V Angle Grinder, 4-1/2 In. GWS18V-45 angle grinder

Key Features

  • Speeds: 10000 No-load RPM
  • Voltage: 18V
  • Weight: 6 lbs
  • Battery Size: 6.3 Ah

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This one is the perfect tool for those who want to buy the device for professional purposes. With a no-load RPM of 10000, these four brush grinder can handle pretty much all kinds of grinding as well as cutting, which makes it ideal for plumbers and electricians.

By using the Electronic Cell and Electronic Motor Protection of Bosch, the grinder ensures you two times the battery and tool life. It means you can work for a long time on a single charge. The brush is also designed in a way to allow long motor life without the frequent need for brush changes.

And the feature that stands out in this angle grinder is the 2-position Vibration Control side handle. It means you’ll feel less tired after a long session of grinding. You can switch the side handle from left to right according to your comfort. The rubber grip on top also provides comfort during operation as well as a better grip.

Also, this model includes a sturdy burst-resistant wheel guard and a never-before-seen in angle grinders user interface that shows your battery level, speed indicator, and if your grinder is running too hot and needs to be turned off.

The paddle switch guarantees safety along with an anti-kickback feature, drop control and restart protection. So you can be assured that the grinder will shut off if you drop it, and will not start suddenly while you’re putting in the battery.

Moreover, the CoolPack technology of 18V batteries will prevent overheating and overloading when it’s running for a long time. Although the grinder comes with a wheel guard and grinding discs, you’ll have to get the batteries separately.

Pros
  • Vibration control
  • Longer battery and tool life
  • 10k no-load RPM
  • Excellent wheel guard
Cons
  • Battery has to be bought separately

4.  Ryobi P421 Cordless Angle Grinder

Ryobi P421 6500 RPM 4 1/2 Inch 18-Volt One+ Lithium Ion-Powered Angle Grinder

Key Features

  • Speeds: 6500 No-load RPM
  • Voltage 18V
  • Weight: 6 lbs
  • Battery Size: 6.0 Ah

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If you’re looking for an angle grinder that can get the job done around the house and won’t cost you a leg and an arm, then this is the one for you.

This one’s adjustable side handle allows working in 3 different positions. In addition, the triggered grip rotates no less than 90°, which means you can attach this thing to any place you desire. The rubber grip allows comfortable handling even with greasy or oily hands.

And the best thing about this angle grinder is the onboard pin wrench, which you’ll get with the unit. It will help you replace the grinder disc, and since it fits in the handle, you won’t have to go looking for it when you need to change the disc.

You should know that the Ryobi P421 has some limitations, like the charge of the battery will not last long, especially in heavy-duty jobs. So, you might end up spending too much time waiting for it to charge while your task remains incomplete. Some owners have also mentioned that it is noisier than other models.

Now this one doesn’t come with a battery, but guess what, if you have other Ryobi cordless power tools, you’ll be able to use a battery from any of them. Since it uses the trusted One+ battery system, you can use any battery from the One+ lithium-ion series.

Overall this is a satisfactory model for any lightweight angle grinding around the house or workshop. Easy to carry, easy to operate and maintain, this is the best budget cordless angle grinder you’ll find.

Pros
  • Cheaper than most models
  • Onboard pin wrench
  • Battery compatibility
  • Includes grinding wheel
Cons
  • Not appropriate for medium to heavy-duty tasks
  • Short battery life
  • Noisy

5. Metabo 18V 6″ Cordless Angle Grinder

Metabo 18V 6

Key Features

  • Speeds: No-load 9000 RPM
  • Voltage: 18V
  • Weight: 6 lbs
  • Battery Size: 5.5 Ah

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The biggest concern for a cordless angle grinder is the insufficient power compared to a corded one. But with this German-made compact cordless angle grinder, you won’t know the difference. This grinder is the perfect combination of portability with performance and power.

Its 18V battery boasts a no-load speed of 9000 RPM. With the 2nd Generation brushless motor, you’ll think you’re using a high powered corded angle grinder. The paddle switch and the quick break system guarantees the highest user safety.

You can be sure that it won’t turn on accidentally thanks to the paddle switch, and the quick break system makes sure that the disc stops within 2 seconds after switching off.

If you need to work overhead or on hard-to-reach places, its slim design and swiveling battery pack will facilitate that easily. Its overload protection protects the motor from overheating, which means you can work longer without having to worry about the battery overheating.

This Metabo 18V angle grinder really goes the extra mile to provide you with safe operation. Its power interruption protection technology protects the grinder from unintentional starting after cutting power, or a change of battery and the Electronic Safety Clutch reduces kickback if the disc stops suddenly or the wheel jams.

Even though the battery and charger are not included with the grinder, you’ll be getting these cool accessories in the box: clip-on cutting wheel guard, dust filter, side handle, and guard.

And if you’ve got Metabo tools with the compatible battery, then it’s definitely worth buying this grinder. But having to buy the battery separately will cost you way too much, and you may start to doubt its worthiness.

Pros
  • As powerful as a corded angle grinder
  • High user safety
  • Brushless motor
  • Ergonomic design
Cons
  • Expensive
  • Have to buy a battery and charger separately

6. KIMO 20V Brushless Cordless Angle Grinder

KIMO 20V Brushless Cordless Angle Grinder, 4-1/2 Inch, 9000RPM w/ 4.0Ah Lithium-Ion Battery & Fast Charger

Key Features

  • Speeds: No-load 9000 RPM
  • Voltage: 20V
  • Weight: 5 lbs
  • Battery Size: 4.0 Ah

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Most of the angle grinders that are out there will come with a brushed motor. The efficiency of those is not that much praiseworthy. However, KIMO kept that factor in mind, and that is why they implemented a brushless motor in this one.

As we mentioned above, the unit comes with a brushless motor. This motor will not only let the unit run for an extended amount of time with a fully charged battery but also make sure that the operational noise is at a minimal level.

Talking about the battery, it features a li-ion technology. Because of that, it will have the same amount of capacity as it had out of the package after 1000 charging cycles.

The grinder is quite powerful as well. It can make the blade rotate at 9000 RPM, which is on par with the rest of the units that are out in the market. There is arubberized 2-position ergonomic grip on the side.

Pros
  • Features an efficient brushless motor
  • Battery retains its overall capacity for a long time
  • Comes with an ergonomic grip
  • Can make the blade rotate at 9000 RPM
  • Operational noise is fairly minimal
Cons
  • Unit overheats quite frequently
  • Power button feels a bit cheap

Things to Consider Before Buying

Angle Grinder is an ideal portable cordless grinder for electricians, plumbers. Now that you have an idea about some of the best angle grinders, you need to make a choice on which one to get. In this section, we’re going to tell you the features that you need to consider and look at before you make that decision.

A good angle grinder can be the difference between a professional touch and a lousy finish. So read on to find out the important factors to consider before buying.

Power and Speed

The number one priority for a power tool owner is the power and speed. And the power of your angle grinder will depend on the kind of tasks that you have to do often.

If you are involved in regular heavy-duty jobs like metal cutting, then you must get a grinder that offers the highest power. But prepare to pay a hefty amount for that.

cutting with cordless grinder

To know how much power an angle grinder can deliver, you have to look at the no-load speed, which is measured in RPM, rotation per minute. It tells you how fast the motor can spin when no disc is installed.

Moreover, the no-load speed of angle grinders ranges from 5000-11000 RPM, but with a cordless one, you might not get one over 9000 RMP. But as we discussed before, there are some really good angle grinders out there that perform as good as a corded one even with 9000 RPM.

Motor

If you want a lightweight angle grinder with better performance, less maintenance, longer runtime, then you have to look for a brushless motor.
You might not see a huge difference between the power of a brushless motor and a brushed one except that the runtime is significantly better in a brushless motor, and it’s much quieter than a brushed motor.

Brushless motors are more expensive, so if you’re looking for a cheaper version or just trying to save money, then opt for a brushed one.

Wheel Size

What you need to remember about wheel size is the bigger the attached wheel, the slower the machine. Since angle grinders are used for a variety of tasks, you need to keep in mind that the size of the disc will determine how deep you can cut while the material determines the surface you’re going to use it on.

An angle grinder with a 4 or 4½ inch disc can be used for pretty much all kinds of tasks. It’s readily available at most hardware stores, and you’ll get the most use out of it.

Battery

For a cordless angle grinder, the battery may be the most important factor to consider before buying. You might get a grinder with the perfect wheel size and power, but without a good battery, you’ll not get your desired performance, nor will it have a long runtime.

Lithium-ion batteries weigh less and can run longer than their counterparts. They also charge faster than other batteries, which means your waiting time will be shortened, and you can get back to work faster.

As you’ve seen in some of the models, we discussed that a lot of angle grinders are compatible with the batteries used in other cordless tools of the same brand. So by getting an angle grinder with a compatible battery feature, you’ll be able to save money on extra batteries.

Weight

One of the most important reasons to get a cordless grinder is the portability it gives you. You don’t have to lug around a cord and be tethered to an electric socket. But if that portability is canceled out by the hefty size of a cordless angle grinder, then what would be the point.

Without the battery, your ideal angle grinder shouldn’t be more than four or five pounds. If you don’t pay attention to the weight of the grinder, you’ll just end up with a bulky tool that will make you wish you used a corded grinder.

And if you’re buying from the store, take the grinder in your hand, feel for the grip and the weight. See how it feels like in your hand. Keep in mind that when the grinder turns on, you’ll need to keep a firm grip, so it’s always better to get a grinder that’s comfortable in your hands.

Safety

There is a reason some brands put a lot of emphasis on safety issues of an angle grinder. Power tools like angle grinder can lead to serious accidents even in the hands of a professional.

Some of the user safety features you should be looking out for are the anti-kickback clutch (which will make sure the grinder shuts off when the wheel is in a bind), restart protection (the grinder won’t suddenly turn on when you put in the battery), and drop control ( if you drop the grinder it will automatically shut off).

A paddle-switch feature makes sure the grinder doesn’t turn on accidentally, and with the Quick Brake system, the grinder stops completely within seconds of turning it off. There’s also overheating protection technology that you can look out for, which ensures that your grinder won’t overheat during operation.

Benefits of Cordless Angle Grinder

Here are some of the benefits of using a cordless angle grinder.

Portability

It goes without saying that the main feature of a cordless angle grinder is its portability. The fact that you’re not tethered to wire for your grinding, sanding, or polishing job should alone be a reason to get it. You won’t be restricted by the limit of a cord, and you’ll be able to reach areas you usually can’t with a traditional one.

DIY Work

Angle grinders are the perfect tool to get rid of rust, old paint and polishing, and sanding. Cordless grinders are easy to operate and are usually light, which makes them perfect for do-it-yourself work around the house.

Instead of calling an expensive expert with a heavy corded grinder, you can fix your problems on your own with your cordless angle grinder.

Cost Cutting

Although you might be paying more to buy a cordless angle grinder, you’ll be saving the cost of the heavy gauge extension cord that you’ll need for a corded one. If your cord is unstable, you’ll suffer from power loss.

When you add up the cost of the cord and the generators, you’ll see that the cordless angle grinders are a much cheaper option.

Frequently Asked Questions

Here we have some of the most commonly asked queries regarding the best cordless angle grinder:

Q: Can a cordless angle grinder really match the performance of a corded one?
A: Yes, almost. Cordless technology has improved immensely due to a need for portability. If you choose the correct cordless angle grinder, you’ll get a pretty good performance. For most work, unless it’s regular for very heavy-duty jobs, a cordless angle grinder will get the job done.

Q: Do angle grinders need a lot of maintenance?
A: Very little, especially if you’re using a cordless angle grinder. If you’re cutting stone or cement, just wipe off the dust after use. If you’re using a brushed angle grinder, you may have to replace it from time to time.

Q: How long will the batteries last?
A: That depends on the kind of work that you do, how long your tool is working, and other variables like the configuration and capacity of the battery. But most brands claim that their Lithium-ion batteries will last about 3 years or 1000 charging cycles.

Q: How long does it take for the battery to charge fully?
A: It’ll depend on the battery’s capacity. Some batteries will take 15 minutes to charge completely but will not last long. There are batteries with more capacity that’ll take 60-90 minutes to charge and will last you a couple of hours.

Q: Which safety gears will I need when using angle grinders?
A: We recommend you wear standard safety clothing that includes gloves, dust masks, goggles, or a face shield. If your angle grinder is particularly loud, wear an ear defender.

So, What Should You Buy

So, what’s the best cordless angle grinder? Each of these angle grinders is suitable for a specific use. The Makita XAG04T is the Overall best value for Brushless motors that are far superior to their brushed counterparts when it comes to performance and runtime. The Bosch GWS18V-45 is a great choice for anyone who looking cordless angle grinder.

If you are looking cheap angle grinder the Ryobi P421 6500 is great for you.  The DEWALT DCG413B is a great cordless angle grinder, its higher capacity batteries run a long time, has also two safety features. What’s best for you might not be the best one for someone else.

Hence, see what’s out there, understand your requirements, and then make an informed decision.

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