Quick answer
Pick a cordless angle grinder by switch type, brake and battery platform, not by the RPM on the box, and don't treat a 3-inch mini grinder as a smaller version of a 4-1/2 inch one. The DeWalt DCG413B and DCG410B and the Milwaukee 2880-20 and 2888-20 are all brushless, paddle-switch grinders on a manufacturer page we could read. The "19,500 RPM" mini grinders are a different tool class.
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What the manufacturers say
We read each manufacturer's page on 2026-10-07 and give figures as labeled. All four are tool only, so a battery and charger are extra.
| Model | Platform | Disc | Speed | Switch | Weight | Safety features the page names |
|---|---|---|---|---|---|---|
| DeWalt DCG413B | 20V MAX XR | 4-1/2 in | "Maximum Speed 9000-rpm" | Paddle | 4.6 lb | Kickback brake (stops the wheel in 2 seconds or less on average, per the page) and E-switch protection |
| DeWalt DCG410B | 20V MAX XR | 4-1/2 to 5 in | "up to 9,000 RPM (no load)" | Paddle | 4.5 lb | Anti-rotation system; the page names no kickback brake |
| Milwaukee 2880-20 | M18 FUEL | 4-1/2 to 5 in | 8,500 RPM | Paddle, no-lock | 3.1 lb without the battery | RAPIDSTOP brake, electronic clutch for kickback protection, overload protection |
| Milwaukee 2888-20 | M18 FUEL | 4-1/2 to 5 in | 3,500 to 8,500 RPM across 5 settings | Paddle, no-lock | 3.16 lb | RAPIDSTOP brake; the page names no electronic clutch |
The DeWalt DCG413B and DCG410B are different models, so check which one a listing prints. The DeWalt DWE4011 corded grinder that appears on Amazon's list isn't on dewalt.com, so we don't give figures for it.
What to look at
- Switch type. A paddle switch you have to hold is a different behavior from a lock-on trigger. Milwaukee's pages call its switches "no-lock".
- Brake and kickback features. The pages name different ones, as above. A feature one page doesn't name may still exist, but don't claim it.
- Platform. DeWalt 20V MAX and Milwaukee M18 are separate systems. Use our battery compatibility checker.
- Variable speed. Only the 2888-20 lists variable speed here.
The 19,500 RPM mini grinders
We read these listings on 2026-10-07 and are not recommending them.
| Listing | What it prints | What we noticed |
|---|---|---|
| TEENO mini grinder | 3 in., 16.8V 2000mAh, 19,500 RPM | Carries Amazon's "Frequently returned item" badge |
| ZFULVO mini grinder | 3 in., brushed, 16.8V 2000mAh, 19500rpm | One reviewer reports it overheating after about 3 minutes |
| AOBEN 4-1/2 in. | 21V, 2 x 4.0Ah, 9,500 RPM max | One 1-star reviewer reports measuring about 2.5Ah and 8,150 RPM; this is one person's test |
A smaller disc turns faster for the same surface speed, so a mini grinder's RPM isn't comparable with a 4-1/2 inch grinder's.
Check the TEENO mini grinder (paid link)
Check the ZFULVO mini grinder (paid link)
Check the AOBEN 4-1/2 in. grinder kit (paid link)
Our off-brand tools guide covers grinders sold as fitting a DeWalt battery.
Where to buy
View the DeWalt DCG413B on Amazon (paid link)
View the DeWalt DCG410B on Amazon (paid link)
View the Milwaukee 2880-20 on Amazon (paid link)
View the Milwaukee 2888-20 on Amazon (paid link)
All four listings we checked are sold by third-party sellers, and the DCG410B listing showed low stock. The 2880-20 listing's attribute reads "Hammerdrill", and the 2888-20 title says "18V" without naming FUEL, so confirm the model number before you order.
Warranty
Read the current terms: DeWalt and Milwaukee.
FAQ
What is the difference between the DCG413B and DCG410B?
On DeWalt's pages the DCG413B is a 4-1/2 inch grinder with a kickback brake, and the DCG410B takes 4-1/2 to 5 inch discs and lists an anti-rotation system instead. Both are paddle-switch, brushless 20V MAX XR tools.
Does the Milwaukee 2888-20 have kickback protection?
Its page names a RAPIDSTOP brake and variable speed, and does not name the electronic clutch that the 2880-20 page lists.
Can a 3-inch mini grinder replace a 4-1/2 inch grinder?
They are different tool classes. A 3-inch disc is smaller, so check the disc sizes and the work you plan before you choose.