can I use 20V MAX Lithium Ion 5 AH battery for this tool? 5 AH is the correct one or no.

Any DeWalt or compatible 20v Li-Ion battery will work. They range from less than 2 Ah all the way up to 6 Ah. They'll all work the same, but the smaller the battery Ah capacity the less time they'll power the tool before recharging.I urge people to consider buying only the bare tool and buying generic DeWalt-compatible batteries. The difference today between the bare tool and the bundle that includes two 5.0 Ah batteries is $150. For $75 or less you can buy two generic DeWalt-compatible (IMPORTANT! all brands are keyed differently and are NOT interchangeable) 5.0 Ah batteries that work just fine. I have purchased 14 DeWalt or compatible 20v Li-Ion batteries thus far. All are working fine, and only two are DeWalt brand. The rest are Enegitech and some other no-name brands. I received one generic that had a problem, and the problem was trivial: the three "fuel gauge" lights would intermittently stay on permanently after the test button was pushed. The vendor immediately offered to refund half my money (I purchased them as a pair), or replace the battery. We decided to take the money and see how much of a problem it was for the lights to stay on. Wouldn't you know it. The problem soon went away! Sticky switch, I guess. But that's the only issue I've had, and we've used these A LOT. For $150, you can either buy these two DeWalt brand batteries or *4* generics. Trust me, if my experience is any indication, you'll be way happier to either spend half as much money for the same thing, or the same amount for twice as many batteries. Note: a 5.0 Ah battery lasts a LONG time. I don't have a grinder, so I don't know how long it'll run, but I have five brushless impact drivers, a hammer drill, a circular saw, a "Sawsall", and a portable shop vac, all DeWalt brand 20v Li-Ion tools. They all run GREAT on the generics. DeWalt doesn't manufacture batteries. They no doubt buy their batteries from the same Chinese factories that produce the generics. The only thing that's different is the cases and the way the slots are keyed so you can't use Black and Decker, Milwaukee, Bosch, etc. batteries interchangeably. The actual Li-Ion cells inside are all the same.

Is this variable speed?

it varies from 0 to 6800rpm in less than a second. ;Dvariable speed would have been a feature i would appreciated a lot and would have made this tool even more useful. but still i'm using it a lot.

Although the product description says it's ideal for electricians, do you think I could cut concrete if I were to use a 4 1/2 in diamond blade?

I've used this grinder to cut 1/2 in Hardiebacker when doing bathroom remodels. I use a cutoff/wafer wheel which isn't ideal for this use but it works. In my opinion it had adequate power but the fully charged battery lasted roughly 20 mins of almost continuous use (I cut about 4 sheets for a tub surround). So, to answer your question, I know it will cut concrete with a diamond wheel, but if I needed to use it continuously for an extended period of time I'd go with something corded which is the case with most battery powered saws/grinders. I hope this helps.

How is the paddle switch on this compared to the trigger switch like all the other cordless grinders?

I find it to be far more ergonomic. Very smooth and responsive. You’ll love this grinder! Just be sure to get at least a 5ah battery or more for. 2ah only last like 10 min of continued use.

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Reviews

R**.

Great tool with no cord!

I've used corded angle grinders for many years and I never expected a cordless angle grinder to be worthwhile. I was pleasantly surprised that this angle grinder works amazingly well. With steady use, the battery will discharge after several minutes, so it's helpful to have a second battery on standby. However, for most standard applications it's worth not dealing with a cord getting in the way. This has plenty of power to work as expected.

8.07.2025

T**T

Good product

love this grinder!!! feels great in the hands and has alot of power

6.01.2026

R**A

Dewalt quality is the best

Great product at a very good price. All the big Box stores wanted full price.

23.12.2025

R**N

Works great !!!

Awesome tool !!!! So glad I started using battery powered tools... No more dragging around a extension cord... Packaged well and fast shipping too !!!

11.10.2025

S**A

Works great

As expected

4.12.2025

C**S

Great tool. Terrible Battery Life!

I love DeWalt tools. I really do. I think almost every tool I own is a DeWalt. And this is a really good grinder. I wasn't even that irritated that it didn't come with a battery or any blades, because the 20v batteries are so interchangeable. The only issue I have is the extremely short battery life! And I do mean SHORT. A fully charged short pack gives you about 5 minutes of use on this thing. Switched it to the thick pack that I use on my chainsaw and that bumped it up to about 15 minutes or use. If you are a contractor or something other than a home improvement DIY'er, this thing would be a serious disappointment! Everything else about it, I love. The grip, the weight... But man, it sucks the life out of a battery!

17.02.2025

J**E

DEWALT grinder

Good tool.

11.01.2026

E**N

Battery tools are coming a long way.

Handy little thing run mine with a 5A/H battery, using to cut 5/32nd thick steel

15.11.2025

J**S

Apesar da ferramenta ser profissional não recomendo para uma serralheria. Pois consome muito bateria. Mas para quem usa para soldar um pouco daqui a pouco usa pra cortar um cano ou sabe se lá oq. É muito versátil a potência e excelente e a praticidade de não ter bateria e ótima. Mas é necessária bastante bateria no mínimo 2 de 4ah e para uso constante não dá tempo de carregar uma enquanto usa a outra. Acredito que em uso sem desligar dure uns 20, 25 min.

23.03.2023

A**E

Excellente meuleuse Dewalt, très bien balancée et surprenamment légère pour la puissance qu’elle offre. Le frein de sécurité (kickback brake) fonctionne parfaitement et ajoute une belle tranquillité d’esprit. J’aime beaucoup la gâchette à deux étapes, ça évite les départs accidentels. Une vraie bête pour le métal, le bois ou même la pierre !

12.10.2025

P**L

Cheap price but legit and authentic..

14.12.2025

F**A

Muy buen producto, funciona bien y es original. Solo considerar usar baterías de 5ah ya que las de 2 se acaban muy rápido

23.12.2025

S**D

Good

22.09.2025

ASIN	B07457BXJW
Batteries	1 Lithium Ion batteries required.
Batteries Included?	No
Batteries Required?	Yes
Battery Cell Type	Lithium Ion
Best Sellers Rank	#2,927 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1 in Power Angle Grinders
Brand	DEWALT
Color	Multi
Customer Reviews	4.8 4.8 out of 5 stars (9,181)
Date First Available	July 21, 2017
Finish	Brushed
Global Trade Identification Number	00885911510844
Horsepower	0.16 Horsepower
Included Components	1) Angle Grinder
Is Discontinued By Manufacturer	No
Item Package Quantity	1
Item Weight	1 pounds
Item model number	DCG413B
Manufacturer	DEWALT
Material	Metal, Plastic
Maximum Rotational Speed	3450 RPM
Measurement System	Metric
Part Number	DCG413B
Pattern	Grinder
Power Source	Battery Powered
Product Dimensions	12.2"L x 4.7"W x 6"H
Shape	Rectangular
Size	One Size
Style	20V Brushless 4-1/2" Grinder (Tool Only)
Torque	2000 Inch Pounds
UPC	885911510844
Usage	grinding
Voltage	20 Volts
Warranty Description	3 year limited warranty
Wattage	20 watts

DEWALT 20V MAX* Angle Grinder Tool Cordless Brushless, 4 1/2 Inch, with Paddle Switch and Kickback Brake, Tool Only (DCG413B)

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