Cutting through a bolt or smoothing a rough weld is a lot easier when you are not dragging a cord around. A cordless angle grinder gives you the freedom to work in the driveway, under a car or out on a job site. The tricky part is that kits differ in speed, battery type, guard style and the wheels that come in the box. This guide compares five popular battery-powered grinders, all sold as kits with batteries and a charger, so you can match a kit to the jobs you actually do.
Below you will find a quick comparison table, a closer look at each grinder, a buying guide and answers to common questions.
| Product | Top Speed | In the Kit | Best For |
|---|---|---|---|
| FULLYEA 4-1/2 Inch Grinder Kit | 12000 RPM, 3 speeds | Two 4.0Ah, charger, 3 cutting wheels | Fast cutting and rust removal |
| AOBEN 21V Grinder Kit | 9500 RPM, 3 speeds | Two 4.0Ah, cutting, grinding and sanding wheels | All-in-one starter kit |
| RhovixStar 3/8-16 Spindle Grinder | 9000 RPM, 4 speeds | Two 4.0Ah, charger, mixed wheels | Tight spaces and overhead work |
| DEKOPRO 20V Grinder Kit | Speed not listed | Two 4.0Ah, 3 cutting and 3 grinding wheels | Beginners and general shop use |
| MAXCULAR 20V Grinder Kit | 9600 RPM, 3 speeds | Two 4.0Ah, grinding wheels and flap discs | Makita battery owners |
Our Picks: Best cordless angle grinders with batteries reviews
FULLYEA 4-1/2 Inch Grinder Kit: A Fast, Feature-Packed Kit for Metal Work and Cutting
The FULLYEA stands out for its top speed. Its brushless motor reaches 12000 RPM with no load, which is the highest number in this group, and a switch on the bottom lets you pick 6000, 9000 or 12000 RPM. That range helps when you move from gentle sanding to cutting steel. If you mostly cut metal or knock rust off steel, the extra speed is the main reason to look at this one.
It also does a good job on safety and convenience. The guard rotates, so you can set it to catch sparks the way you work, and there are non-slip handles for both left- and right-handed users. A spindle lock speeds up wheel changes, and a power indicator on the battery shows how much charge is left. The kit includes two 4.0Ah batteries, a fast charger, three cutting wheels and a tool case, so it is ready to work out of the box.
Pros:
- Highest no-load speed in this lineup at 12000 RPM
- Three speed settings for cutting, grinding and sanding
- Rotating guard and spindle lock make setup quicker
- Two batteries, charger, cutting wheels and case included
Cons:
- Includes only cutting wheels, so you will need to buy grinding discs separately
Verdict: Choose the FULLYEA if you want the most speed and the most adjustable guard in a complete kit.
AOBEN 21V Grinder Kit: A Well-Rounded Kit With Plenty of Wheels in the Box
The AOBEN is the pick for people who want to start working right away without a separate trip for discs. Besides the grinder and two 21V 4.0Ah batteries, the case holds cutting, grinding and sanding wheels, two of each. That covers cutting a bolt, smoothing a weld and cleaning up a rough edge. Its top speed is 9500 RPM across three settings, which is lower than the FULLYEA but still plenty for most garage jobs.
It also comes with two wheel guards, a regular one and a half-covered one, so you can choose more coverage when sparks are flying. The 5/8-11 spindle and 7/8 inch arbor fit common 4-1/2 inch accessories, and an auxiliary handle helps with control. One thing to know: the battery packs are not compatible with other brands, so you are buying into this tool’s own batteries. The smart chip may also pause the tool briefly if it overheats or overloads, then let it recover.
Pros:
- Cutting, grinding and sanding wheels all come in the kit
- Two guard styles for different tasks
- Standard 7/8 inch arbor and 5/8-11 spindle fit common wheels
- Overload and overheating protection helps guard the motor and battery
Cons:
- Batteries only work with this brand, so you cannot mix in packs from other tools
Verdict: Pick the AOBEN if you want a ready-to-go kit that includes cutting, grinding and sanding wheels.
RhovixStar 3/8-16 Spindle Grinder: A Lightweight Option With a Different Spindle and Four Speeds
This RhovixStar model is the odd one out. Instead of the standard 4-1/2 inch grinder spindle, it uses a 3/8″-16 spindle, which the listing says gives it wider accessory compatibility. It also offers four speed settings up to 9000 RPM, so you can go slower for polishing and faster for cutting. If you like fine control over speed, that extra step is useful.
The other big draw is size. It weighs under 4 pounds, and the compact body is meant to ease wrist strain when you work overhead or in tight spots like under a car or around pipes. An adjustable auxiliary handle suits left- and right-handed users. The kit adds two 4.0Ah batteries, a rapid charger, one guard, and a mix of cutting, sanding and grinding wheels. Keep in mind the spindle is different, so check that the accessories you already own will fit. The listing may show as unavailable at times, so check its current status on Amazon.
Pros:
- Four speed settings up to 9000 RPM
- Under 4 pounds, which helps in overhead and tight spaces
- Adjustable handle works for left- and right-handed users
- Kit includes cutting, sanding and grinding wheels
Cons:
- Uses a 3/8″-16 spindle, so your existing 4-1/2 inch wheels may not fit
- Availability may vary, and only one wheel guard is included
Verdict: Consider the RhovixStar if light weight and four speeds matter more to you than using standard wheels.
DEKOPRO 20V Grinder Kit: A Simple, Safety-Minded Kit for Workshop and Garage Jobs
The DEKOPRO keeps things straightforward. It is a 20V brushless grinder aimed at everyday cutting, grinding, sanding and polishing around the workshop, garage or jobsite. What sets it apart is the accessory count: you get three cutting wheels and three grinding wheels, plus a carrying case. That makes it a good first grinder because you can handle several jobs without buying anything extra.
Safety and control get attention here too. Two wheel guards, a standard one and a half-cover style, help block sparks and chips. The two-position auxiliary handle can be mounted on either side for better balance, and a spindle lock makes wheel changes quicker. Wheels with a 7/8 inch arbor fit, which keeps accessories easy to find. The supplied data does not list top speed or speed settings, so if variable speed is a must-have, the FULLYEA or AOBEN gives you clearer numbers to work with.
Pros:
- Three cutting wheels and three grinding wheels included
- Two guard styles for sparks and debris
- Handle mounts on either side for comfort and balance
- Standard 7/8 inch arbor keeps wheel choices wide
Cons:
- Speed settings and top RPM are not listed, so it is harder to compare power
Verdict: The DEKOPRO is a good fit if you want a no-fuss starter kit with plenty of wheels and guard options.
MAXCULAR 20V Grinder Kit: The Best Fit If You Already Own Makita Batteries
The MAXCULAR has one clear advantage over the rest: it is compatible with Makita batteries. If you already have Makita packs on a shelf, you can run them in this grinder and skip the cost of building a new battery collection. It also accepts wheels from 4-1/2 to 5 inches, so you have a bit more room than the other 4-1/2 inch grinders here.
Under the hood it has a brushless motor that reaches 9600 RPM and three speed settings. The battery level indicator tells you when it is time to recharge, which saves you from running out mid-cut. A two-position auxiliary handle suits left- and right-handed users, and the non-slip design helps control. The kit includes two 20V 4.0Ah batteries, a fast charger, three grinding wheels, two flap discs and a case, though only one wheel guard. If you do a lot of cutting, you may want to buy cutting discs separately.
Pros:
- Works with Makita batteries
- Accepts 4-1/2 to 5 inch wheels
- Battery level indicator and three speed settings
- Flap discs and grinding wheels included
Cons:
- Only one wheel guard, and cutting discs are not listed in the kit
Verdict: Go with the MAXCULAR if you already own Makita batteries or want to use 5 inch wheels.
How to Choose the Best Cordless Angle Grinder
Start With the Battery System
Battery choice is the biggest long-term decision. Most kits here come with two 4.0Ah packs, which lets you swap one in while the other charges. The catch is compatibility. Some brands only work with their own packs, while one kit here accepts Makita batteries. If you already own cordless tools, check whether the grinder can use the batteries you have. If you are starting fresh, a kit with two batteries and a charger is the easiest way to begin.
Look at Speed and Speed Settings
Higher RPM cuts and grinds faster, but control matters just as much. A grinder with several speed settings lets you slow down for polishing, sanding or delicate work and speed up for cutting steel. Kits in this group range from 9000 to 12000 RPM at the top end. If you mostly cut metal, favor the faster options. If you switch between sanding, grinding and cutting, a model with more steps gives you more control.
Check Wheel Size and Spindle Type
Most of these grinders take 4-1/2 inch wheels with a 7/8 inch arbor, which are easy to find and cheap to replace. One kit uses a 3/8″-16 spindle instead, and another accepts wheels up to 5 inches. Before you buy, think about the discs you already have and whether they will fit. A different spindle can be handy, but it may mean buying new accessories.
Think About Guards and Safety
A wheel guard protects you from sparks and flying chips, so it is not a part to skip. Some kits include two guards, a regular one and a half-covered one, which gives you more choice for cutting. A rotating guard lets you adjust coverage to match your work. Also look for overload and overheating protection, which can pause the tool to protect the motor and battery. The product data does not list kickback control, an electronic brake or the type of on/off switch (paddle or slide) for most of these kits, so check the listing if those matter to you. Always wear a face shield or eye protection, hearing protection and gloves, and keep sparks away from anything flammable.
Consider Weight, Handles and Comfort
A grinder you can hold comfortably is a grinder you will use more safely. A lighter body helps with overhead work and tight spots, while a two-position or removable auxiliary handle improves balance for left- and right-handed users. Non-slip grips add control when your hands are dusty. A spindle lock is another small feature that makes changing wheels faster.
Use It Safely
Keep the guard on and use the side handle so you have two hands on the tool. Match the disc to the grinder: its maximum RPM rating must be at least as high as the tool’s top speed, which matters most on faster models like the 12000 RPM FULLYEA. Take the battery out before you change a disc, and let the wheel stop completely first. Sparks can ignite sawdust, rags and fuel, so clear the area before you start.
See What Comes in the Kit
The box contents change the real value of a kit. Some include cutting, grinding and sanding wheels, while others stick with only cutting or grinding discs. A carrying case keeps everything together. If you are buying your first grinder, a kit with a mix of wheels means you can start right away. If you already own discs, you may care more about battery and speed than extras.
Frequently Asked Questions
Are cordless angle grinders powerful enough for metal cutting?
Brushless models like the ones above are built for cutting, grinding and rust removal on metal. Speed settings and battery size affect how long and how hard you can work. For long cuts or heavy jobs, keep a second battery charged and let the tool rest if its protection feature pauses it.
What does a brushless motor do?
A brushless motor is designed to run more efficiently, produce less heat and last longer than a traditional motor. For you, that usually means better battery use and a tool that holds up over time.
How long will a 4.0Ah battery last?
Runtime depends on the task, the speed you choose and how hard you press. Cutting thick steel drains a pack faster than light sanding. Having two batteries lets you swap and keep going while one charges.
Can I use batteries from other brands?
It depends on the grinder. One kit here is listed as compatible with Makita batteries, while another notes that packs from other brands are not compatible. Always check the battery system before you buy.
Do I need a different guard for cutting?
A half-covered guard gives more protection during cutting, which is why some kits include two guards. Whatever you choose, always use a guard that suits the task and wear eye protection.
What safety gear do I need with a cordless angle grinder?
Wear a face shield or safety glasses, hearing protection and gloves, and keep the guard in place. Use the side handle, keep sparks away from flammable material and remove the battery before changing discs. Never fit a disc rated below the grinder’s top speed.
Which wheel size should I buy?
Most of these grinders use 4-1/2 inch wheels with a 7/8 inch arbor. One accepts wheels up to 5 inches, and one uses a 3/8″-16 spindle, so check the fit for your accessories first.
Final Recommendation
The right grinder depends on what you already own and the work you do most. If you want maximum speed and a flexible guard, the FULLYEA is a strong pick. The AOBEN is a great all-around starter because it packs cutting, grinding and sanding wheels in the case. The DEKOPRO is another easy beginner kit with lots of wheels. If you need to get into tight spots, the lighter RhovixStar is worth a look, as long as you are fine with its different spindle. And if you already have Makita batteries, the MAXCULAR will save you money on power packs. Whichever you choose, make sure the battery and wheel fit match your needs, and always keep the guard on and wear eye and hearing protection.