DEWALT DCG413B Review: 20V MAX XR Brushless Angle Grinder and Maintenance Guide

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Introduction

This DEWALT DCG413B review covers the 20V MAX XR 4-1/2-inch paddle-switch small angle grinder with kickback brake, sold as a tool only. It is meant for metalworking, maintenance, and surface preparation where a cord is in the way and the user already has — or will buy — a 20V MAX battery and charger.

DEWALT states that the battery and charger are sold separately. This article does not claim a personal test, a price, or a runtime result. Specifications are taken from DEWALT’s DCG413B product page.

Product overview

An angle grinder spins an abrasive wheel at high speed. With a grinding wheel and the guard installed, it is used to smooth welds, remove rust or scale, and prepare metal surfaces. With a cutoff wheel that is rated for the tool’s speed, and with the correct guard still in place, it can cut metal stock. The accessory, not the tool name alone, decides whether the job is grinding or cutting.

The DCG413B is a cordless 4-1/2-inch class grinder on the 20V MAX platform. DEWALT notes that 20V MAX is the maximum initial battery voltage without a workload, and that nominal voltage is 18. Because this SKU is tool only, the grinder will not run until a compatible pack is added.

Key features

Practical applications

Appropriate work, when the manual and the accessory allow it, includes weld cleanup, rust and paint removal with a rated wire or flap wheel, edge prep before welding, and short cuts in metal with a rated cutoff wheel and the guard installed. Cordless power helps on ladders, trailers, gates, and jobsite steel where an extension cord is a trip hazard.

This is not a claim of measured runtime. Continuous grinding consumes battery quickly. Users who grind for long stretches often keep a corded grinder as well, or stage more than one 20V MAX pack. Do not use the tool on materials or with wheels the manual does not allow.

DCG413B specifications

No-load RPM was not in the specification block verified for this article, so it is omitted rather than guessed.

What’s included

DEWALT’s includes list for the DCG413B is:

• (1) Grinder
• (1) Side handle
• (1) Hex key
• (1) Inner and outer flange
• (1) 4.5-inch Type 27 guard
• Battery: not included
• Charger: not included
• Grinding or cutting wheel: not listed as included

Pros and cons

Pros

• Cordless 4-1/2-inch grinder for work away from an outlet
• Brushless motor, so there are no brushes to change
• Paddle switch with a two-stage start and E-switch restart protection
• Kickback brake is a listed safety feature
• Guard, side handle, and flanges come with the tool
• Shares 20V MAX batteries with other DEWALT cordless tools

Cons

• Tool only — a compatible battery and charger are an extra cost if you do not own them
• No wheel is listed in the box
• Long grinding sessions need spare packs or a corded grinder
• A kickback brake reduces risk; it does not remove it
• Users on Milwaukee, Makita, or RYOBI batteries may not want a second charger system

DEWALT angle grinder maintenance

Use the official DCG413 instruction manual for cleaning, wheel changes, and repairs. These steps are the practical checklist, not a replacement for that manual.

• Remove the battery before inspection, cleaning, or changing accessories.
• Inspect the grinding wheel, guard, side handle, flange components, and tool body before use.
• Replace damaged, cracked, or unsuitable accessories. Do not “make do” with a wheel that is the wrong size or speed rating.
• Keep ventilation openings clean according to the manual.
• Inspect the battery and charger for damage before charging. Do not charge a swollen or cracked pack.
• Use qualified service for repairs. Do not open the gearbox or defeat the switch.

Safety guide

• Wear eye and face protection, hearing protection, and clothing that will not catch in the wheel. Gloves must not be loose enough to snag.
• Install the guard correctly and leave it on. Never remove the guard to make a cut.
• Use accessories rated for the grinder’s operating speed and for the job — grinding, cutting, or wire brushing — as the manual allows.
• Keep sparks away from people, fuel, solvents, and other flammable materials. Know where sparks will land.
• The kickback brake reduces movement in some bind-up events. It cannot guarantee that you will not be injured. Keep a firm grip and a stable stance.
• Let the wheel stop before you set the tool down.

Prices are not listed. They were not verified, and they change by seller. Competing models are named only. There is no affiliate link for them. Where a figure was not confirmed on a manufacturer page for this article, the cell says so instead of guessing.

Which alternative fits which buyer

• Milwaukee 2880-20 suits shops already on M18 who want a FUEL cordless grinder and will buy or reuse M18 packs.
• Makita XAG04Z suits 18V LXT users who want a brushless 4-1/2 / 5-inch grinder as a bare tool.
• RYOBI P423 suits ONE+ users comparing a 4-1/2-inch cordless grinder. Confirm motor, brake, and included guard on that listing before you rely on them.
• DCG413B suits 20V MAX users who specifically want the XR paddle grinder with kickback brake and already own a battery.

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Who should consider buying it?

Buy the DCG413B if you grind or cut metal away from a convenient outlet, you want a brushless 4-1/2-inch paddle grinder with a kickback brake, and you already have a DEWALT 20V MAX battery and charger — or you have budgeted for them. Maintenance technicians and serious DIY metalworkers are the clearest fit.

Who might prefer an alternative?

Choose another option if you have no 20V MAX batteries and do not want to buy a pack and charger, if your work is hours of continuous grinding better served by a corded grinder, or if your batteries are already Milwaukee, Makita, or RYOBI. Also skip it if you need a larger wheel class than 4-1/2 inch.

Final verdict

The DEWALT DCG413B is a tool-only 20V MAX XR brushless 4-1/2-inch angle grinder with a paddle switch, two-stage start, E-switch protection, and a kickback brake. Those are meaningful features for metal grinding and guarded cutting, provided the right wheel is used and the guard stays on. The main limitation is the bare-tool configuration: budget for a 20V MAX battery and charger, and for abrasives, before you count the cost. It is a sound choice for people already on that platform. It is a poor first purchase if you grind all day on a cord or if your batteries belong to another brand.