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For Ryobi R18AG-140S, 268 customer reviews collected from 1 e-commerce sites, and the average score is 4.7.

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29.2.2020

I have had a battery powered grinder before from another brand and it was pants. The lack of torque just meant it bogged down almost immediately making it useless in practice. Honestly I wasn't going to bother buying another cordless grinder but when I saw this on offer - and being a user of Ryobi tools - I gave in and tried again.First off I will say that I have loads of Ryobi stuff going back ten years. I started buying their tools when they first changed to the lime green colour because they were well priced and did the job. Clearly made to that lower price nevertheless they proved to be very robust and the batteries utterly superb.I have spend ten solid years renovating a house including digging out under it and putting on another floor using Ryobi tools with little care at all. So far none have broken despite the abuse. And one battery I bought eight years ago has just carked it despite it having been charged hundreds and hundreds of times. Damned impressive.Since those first two drill/drivers I bought made with hard shiny plastic Ryobi have steadily pushed the quality upwards. My latest drills are easily as good as the trade stuff like DeWalt and Milwaukee. In fact Ryobi and Milwaukee are owned and made by the same Hong Kong company, Techtronic Industries in their own facilities. And of course they have different internal parts. Not...Of course a couple of things to note with the increased quality. The weight has gone up as well as the price.Anyway, this tool is super well made, has high quality materials in its case and is easy to hold given the handle design. The overmoulded rubber grips are very good indeed and the side handle can be mounted on either side for lefties or righties. It's vibration isolating as well.However I have a couple of things to note. Firstly my day job is a marine Chief Engineer and as such using metal working tools specifically grinders is a daily thing on a ship. Welders will also know this but the handle which is always supplied is never used by 'professionals' - ever. Not once in any shipyard or welding shop have I seen a small grinder with a handle fitted. Same on a ship. They are just annoying and get in the way.The other thing is that the power switch is a 'dead-man' one. In other words you have to keep it depressed to keep the grinder going which, is a pain. If you are using a grinder in the perfect position as shown in the advertising bumph where it's at bench height and you are pressing down then fine. However, these sized grinders are used for working in all sorts of positions and that means you might have to move your hands away from the switch. That's why most grinders don't have a dead man but instead a locked on power switch. This grinder being battery type is, one would have thought even more likely to be used for convenience of location thus the hold on switch even more irritating.Bottom line is that if I'd known the switch could not be locked in place I'd probably not have bought it despite it's other qualities.Putting that aside in use this is excellent. It didn't bog down at all and the battery I used 4Ahr lasted well and provided plenty of power.It is a bit larger than a mains unit but is well balanced and the handle part being slimmer makes it easy to hold.Overall this would have been a winner had it not been for the dead man switch.
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23.2.2015

I was apprehensive that an 18 volt battery could drive an Angle Grinder with any degree of stamina and endurance. The Ryobi R18AG-O 18v One plus fitted with an 18v 4.0 Ah Li-Ion thick pack battery soon removed any reservations I might have had on that score and I need not have worried.The Ryobi performed like a dream. Metal cutting,Grinding & paint scraping with a wire brush, were absolutely no problem. I particularly like the Auxillary Side Handle which is attached to the Body of the Grinder in 3 alternative positions, namely 3 o`clock, 12 o`clock and 9 o`clock.. The safety guard is easily removed and replaced. Comes supplied with a wrench for removal/attaching discs/brushes etc.The overall length of the Angle Grinder, without a battery fitted, is 330mm/13". Fitted with a 4.0Ah Battery, Auxillary Side Handle and a Standard 115mm Grinding Wheel, the unit weighs in at 5lb 14ozs (2660 grams)I would recommend the 4.0 Ah Battery for its durability when using it with the Angle Grinder as opposed to batteries of lower capacities. When you consider that the motor in the Ryobi Angle Grinder delivers 7,500 RPM, the 4.0 Ah battery is the way to go with this particular Tool from the Ryobi range. Impressive.
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11.5.2016

I had the older model of the grinder and it was getting a little old and weak. As I have a lot of the Ryobi one+ system it was a simple choice and so much cheaper than the more regarded brands. Anyway only used it a couple of times so far but absolutely impressed with it. I use the 4amp batteries and it lasts more than long enough for the small jobs an electrician does. I cut a couple of small plates out of 4mm steel today and it was a breeze Time will tell how long it lasts and if the performance keeps up but so far really pleased and very surprised how much better than the old model it actually is. The only thing I would criticise it for is that it no longer comes with the key built into the handle for removing the disc's.I thought that was a really neat idea on the old model. Luckily though I still have mine off the old grinder and it fits on the new one. For small jobs having a battery grinder can save so much hassle. I had to take some lights down using a cherry picker once and the bolts were seized on my battery grinder might the job simple so well worth having one .Dave
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4.11.2019

I was attracted to this by one of the regular emails from Amazon which, if I’m honest, often get ignored.Buying it as a set gives a very substantial saving over buying the component parts separately. If looking at alternatives make sure that they include a battery and charger, potentially £80 if you buy them separately. I like the concept of the 18V ONE + because, if travelling, you can share batteries between tools of the same range, giving flexibility and saving weight and space.It seems to be a quality product, easy to use and with minimal vibration unlike some grinders whose vibrations make them unpleasant to use. While ear protection is recommended, it seems quieter than many others.The charger gives clear battery status and a reasonably short recharge timeFor a cordless tool it has a decent endurance but the battery life is finite , as on all cordless tools, so my next purchase will be the 5Ah battery, although the price of a 5Ah battery is nearly as much as the complete set!
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16.2.2015

I'd been trying to justify buying one of these for my extensive 1+ collection for a while.When I got the chance to get this on 'Black Friday' for just £40 it was a no-brainer.I've only had a play with this - not yet used it in anger - but it seems extremely rugged and the power is astonishing. My impression is that it's on a par with my corded AEG.How long it'll go on a battery pack I don't know but that doesn't really concern me since if it was a big job I'd get out the mains powered one.I used (and would always use) a 4Ah Li-ion pack with it. I doubt it'd be much good with a NiCd pack. I exclusively use Li-ion now and have thrown out the NiCd's that came with my first foray into 1+ many yearsago.
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27.5.2019

My 30 year old corded angle grinder has finally died, and having bought into the Ryobi System, thought I'd try the angle grinder.It is a heavy piece of kit, and adding a 4ah battery makes it even heavier. It was noticably less able to cut rebar than my old B&D corded one, and given I don't need cordless I decided to return it and get a cheaper corded one - in fact i could get two - one for grinding, one for cutting, for almost the same money.A perfectly acceptable tool if you need cordless and have the Ryobi batteries already, but not quite the power ( and much heavier) than corded. If it's your first battery tool, I would recommend having a look at Bosch/Makita etc before making a decision

29.10.2018

I was a bit skeptical that I really needed this tool, should I or shouldn't I get one, but then I thought hey it's Christmas. :) This little angle grinder is best suited with the 5ah batteries which give it the full power it likes. With a 1 mm wide cutting disk on it, it cuts through rebar no problems and is also good with a sanding disk. One other use i get out of it is with a small TCT cutting blade it helps trim those thicker branches in the hedge. It obviously doesn't have the RPMs of a mains angle grinder but in some ways that makes it more controllable and less aggressive, in any case I've been using it for nearly a year and have found it to be reliable and a handy tool to have.

28.5.2018

I have several other Ryobi power tools and when my corded angle grinder finally landed in the recycling bin this seemed a natural choice as a replacement. Although this was a more expensive option than buying a corded replacement from the DIY store I have the 18+ batteries so decided to give it a go. Personally I find this better balanced and easier to use than a corded version, and can of course be used anywhere. The motor weight seems to be counter-balanced by the battery which works well for me; I'm using the larger 4ahr battery's which give longer life but it's early days and time will tell how this works out in the long term.

4.3.2020

Really struggled with hacksaws to take apart an old large rusted fruit cage and as I have a selection of Ryobi tools and batteries decided to get this model. Just make sure you have more than one battery, the most powerful type, as you'll get through them at a fair old rate. Also choose the best quality discs and you'll get the most out of this tool. Be careful on seating the discs and always keep the locking tool with you as I found that the occasional one would work loose when cutting. Overall did the job I wanted it to do and would recommend if you had jobs to do away from a suitable power source

20.6.2016

I'm new to Ryobi, but their kit appears to be well designed and well made. Comes with clear instructions, solid, easily recycled packaging and even a free grinding disc to get you started.I used the 5ah battery, and was surprised at just how good (and handy) a cordless angle grider is. First job was to cut the tops of fire extinguishers which it did with ease - remember to clamp the material down though!Would I buy more Ryobi kit? Certainly, if it's as well designed and well made at the angle grinder.Remember this unit comes without a battery! I can recommend the 5ah battery and charger (

1.4.2018

There is nothing that I dislike about this product. I bought it for a particular job. I had a gate to fit in the middle of no where. Knowing that I would have to alter the heavy duty iron gate furniture I was using. The grinder didn't disappoint. Using a 5ah battery generic not Ryobi. Cut though the hinges and bolts a treat using slitting discs. Can't give details of run time as the work was done so quickly all I can say just so glad I had it to hand. Made the whole job that much easier and better looking. This wasn't a heavy work load job. But having this tool to hand made all the difference.

31.12.2014

Alan Metcalfe ( further down in the comments ) said " NO POWER " I do not know what trade he is in? , but he certainly does not know how much power is required to make a tool like this work . I will say this " Do not expect fantastic results from a 1.3 or 1.5AH li-ion Battery , use a 4.0AH Battery and then comment , if you have a prolonged Job then Purchase 2 x 4.0AH Battery's and make sure you have a Ryobi super Charger so you can charge quick .Just a point of note , does anyone know of other Tool manufacturers that make a cordless Angle Grinder , I would like to compare.

3.12.2020

Very good quality and compact angle grinder. It comes with a 3 year warranty so if someone in the reviews is, crying that button broke after 2 years it's your problem because you didn't register it. And also STOP CRYING and put it back in place! There is really nothing to complaint about this piece of tech. Also remember that this is DIY brand. So if you are planning to buy for renovating houses for a living just go for another brand like Milwaukee or Dewalt but if you want it just for your household and garage I can bet it will last 20 years.

28.4.2019

I'm using 1.3Ah battery ( all I have at the moment) and it did shut down cutting through the thin steel pipe couple of times (especially putting little strength to the grinder)- I'm not sure if it is some sort of safety feature, lack of power or simply too small Ah battery ( recommended battery for this tool is 4Ah ) Thought *Ah is related to how long battery last, but can be the factor of how much power grinder drains per cut? Not sure.. Feels solid tool tho, resting in the car boot, no more clamping down tickets for me :) Just kidding ..

5.3.2016

I never could see why I would need an angle grinder until I attempted multiple cuts on Indian Sandstone paving (to fit an awkwardly-shaped patio). My Ryobi circular saw and Ryobi jigsaw just weren't up to the task. This, on the other hand, cuts through the stone like a knife through butter. It confirms my view that Ryobi cordless tools are just as powerful as their mains-powered equivalents. You will, however, need to have or buy the high-power lithium battery if you are planning to do some heavy duty and/or lengthy cutting.

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