Ryobi ZRP421 One+ 18V Cordless 4-1/2" Angle Grinder

Ryobi P423 One+ 18V Brushless 4-1/2 Angle Grinder Review

Quick Overview





  • Affordable 4-1/2 cordless angle grinder with 10,400 RPM
  • 3-position ergonomically designed side handle for increased comfort
  • Lightweight cordless angle grinder that weighs just 4.3 lbs
  • Compatible with all Ryobi P100 series batteries
  • Tool free guard adjustment that allows for quick depth or angle adjusting


  • Motor seems to run warm with extended heavy-duty use

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Ryobi is known for making high-quality, durable power tools, particularly the cordless variety, that can get the job done no matter what. The Ryobi P423 One+ 18V Brushless 4-1/2 Angle Grinder is an excellent buy if you have small- and medium-sized DIY home projects to complete.

It's a portable battery-power so you can take your work anywhere you want. So, if you need a reliable power tool that can help you complete a wide range of projects at home, this angle grinder should definitely make it to your list, more so if you already own Ryobi ONE+ battery-powered tools.

Ryobi P423 One+ 18V Cordless 4-1/2" Angle Grinder

What we have here is a compact yet highly efficient cordless tool suitable for all kinds of applications. It has some useful features that will help you finish any grinding, cutting, sanding, sharpening, and polishing DIY jobs at home.

The Ryobi P423 might not be the most powerful angle grinder on the market, but for an cost-effective cordless angle grinder, it's more than powerful enough to cut dense metal, ceramic tiles,  and grind off rust and corrosion, plus a whole lot more.

Regrettably, the Ryobi P423 we reviewed here doesn't come with an 18V One+ battery without forking out he extra cash. Although, the P423 does work with all of Ryobi's P100 series battery range.

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What to expect

Ryobi has a long tradition in power tools, so they know precisely what a useful tool looks like. This particular cordless angle grinder is suitable for all kinds of small and mid-level home projects. It's good for beginners because it's effortless to master and use.

Furthermore, since there are no cables, you won't have to step over them and watch your footing all the time. The robust motor can produce up to 10,400 RPM, and the operating time ultimately depends on the battery you buy. 

The downside is that there are no batteries included. The lack of batteries with this cordless grinder could complicate things if you don't already own a Ryobi One+ tool. But, if you're already a fan of Ryobi and own any of there other tools. you can simply utilize the existing battery compatible with Ryobi's P100 series battery range.  

Also, if you're looking for a fearless professional grinder that can take on just about any heavy-duty construction job site task, this might be the wrong choice. The Ryobi P423 does give DIYers a great deal of power to tackle jobs around the house 10,400 no-load RPM, but it might struggle when tested under excessive load on a daily basis. 

What's included?

Sadly, this tool doesn’t come with a battery or a charger. You will have to buy a P100 series battery (the bigger, the better) and the One+ fast charger. However, the purchase does include a side handle, one grinding wheel, and a spanner wrench for quick wheel changes. You get everything you need, except the battery, but if you already own any cordless Ryobi tools, that may not be a problem.

Features overview

When compared to similar tools, this Ryobi cordless angle grinder has only the basic features without any extras or complications. It delivers up to 10,400 RPM, enough for medium to heavy-duty home projects. You can move the guard without any extra tools. There's an onboard wrench storage compartment for the tool you need to change the wheel.

The GripZone over-mold provides a secure grip and improves comfort. The tool has an ergonomic design, so you won't feel much fatigue even after prolonged use. The side handle has three available positions, so you can switch to either one, depending on the task at hand. You also have a trigger switch that's very easy to use.

When you let go of it, the motor will stop the wheel in a second. The tool weighs 4.3 pounds without the battery. Get a bigger one if you don't want to think about your battery level all the time. You can use this cordless angle grinder for a wide range of materials and home improvement jobs.

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How to use

Using this power tool is very straightforward. You only need to pair it with an 18V One+ battery, and you're ready to go. Press the finger trigger, and the wheel will start turning at extreme rapid speed to grind or cut though whatever material you working with.   

You can use the tool for all kinds of tasks. Just make sure that the batteries are charged before you use it because it takes about two hours to charge in full. You can switch the position of the handle and the guard, so the angle grinder can fit either of your hands.


Since the Ryobi P423 is a bare tool option and comes without a battery, you’ll unfortunately have to spend the extra dollars to acquire an 18V One+ battery if you already don't have one.

Furthermore, not getting any extra accessories with the Ryobi P423 might be disheartening to some of you would-be angle grinder buyers.

If that's the case and you'd like something else that provides more value but still has the power to produce up to 10,000 RPM, the POPOMAN 20V MAX Brushless Cut-Off Angle Grinder is the power tool for you. It also comes with a bunch of useful accessories and other awesome features designed to make the toughest jobs more manageable.

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There's not much to this Ryobi cordless angle grinder. It's a bare tool with essential features like a 3-position handle and a trigger switch that's straightforward to use, so it's suitable for beginners.

It won't help you if you have a lot of grinding and cutting to do, but it will prove its worth on small DIY home projects and other jobs. You need to own a One+ battery, or you'll have to buy it separately for use with this tool.

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