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  • RoboMow RL850 Robotic Cordless Electric Lawn Mower, 21-Inch
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RoboMow RL850 Robotic Cordless Electric Lawn Mower, 21-Inch

35 customer reviews

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  • Robotic lawnmower designed to mow entirely by itself
  • Efficiently and safely mows lawn, while you relax
  • Cuts up to 10,800 square feet on a single 24-hour charge
  • Onboard sensor and bumper avoids obstacles; built-in child safety lock; powerful mulcher
  • This item is not for sale in Catalina Island
This item’s packaging will be visible when delivered and cannot be gift-wrapped.

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Product Description

Amazon.com

Imagine relaxing on your porch with your family instead of mowing the lawn. With the innovative Friendly Robotics Robomow RL850, you can turn your dreams into a wallet-friendly reality. This fully automatic lawnmower cuts grass all by itself, so you can get a vacation from mowing--forever! Just drive the Robomow to the edge of your yard and press 'Go' for a beautifully manicured lawn.


Robomow RL850
At a Glance:
  • Automatic lawnmower mows entirely by itself
  • Cuts up to 10,800 square feet in a single charge
  • On-board sensor and bumpers to avoid obstacles
  • Grasscycles for a healthier, greener lawn that requires less water
  • Quiet operation means you can mow day or night


Robomow does all the work so you don't have to.


Operates without gas, oil, or spark plugs.
Automatic Lawnmower Does All the Work for You
The Robomow RL850 is an innovative lawn mower that works automatically, so you won't have to spend another weekend pushing your old gas guzzler around the yard. It mows on its own within a boundary that you outline with a thin wire (included). Once you handle the initial wire setup, this mower does all the work for you--simply press 'Go', sit back, relax, and mow!

Powered by exclusive drop-and-go 24-volt batteries, the heavy-duty Robomow RL850 is a 53-centimeter, 21-inch mower/mulching system. With its three blades spinning at 5,800 RPM--double the speed of a typical gas mower--the Robomow RL850 travels across your lawn in a crisscross pattern, covering up to 10,800 square feet on a single charge. Easy to set, the Robomow RL850 delivers a 1.75- to 3.25-inch cut with high-cut blades and a 1.0-2.5-inch cut with low-cut blades.

Wallet-Friendly Choice
Unlike conventional lawn mowers that pollute as much as 40 late-model cars in just one hour of use, Robomow RL850 offers a way to keep your lawn looking great without sacrificing the environment.

The Robomow RL850 doesn't simply cut your grass--it repurposes the clippings through a patented process called grasscycling. The mower cuts grass into fine clippings and disperses the cuttings over the ground. These clippings quickly decompose and release valuable nutrients and water into the soil, resulting in a better-looking lawn. Grasscycling also leads to a deeper, healthier root system that increases your lawn's resistance to disease, drought, and insects, and it reduces the amount of water your lawn needs by as much as 85%.

And because the Robomow RL850 doesn't require gas, oil, tune-ups, or spark plugs, it will save you money.

Multiple Features for Safe, Quiet Operation
In addition to its environmental benefits, the Robomow RL850 offers several user-friendly, neighbor-friendly features. First, a user-controlled theft protection system guards the mower from unauthorized use, and a child lock provides peace of mind.

An on-board sensor and bumpers identify obstructions like trees, rocks and obstacles, and truly quiet operation means you can mow your lawn at any hour without disturbing your neighbors.

Dimensions and Warranty Information
The Robomow RL850 is WEEE and RoHS compliant, measures 26.0 x 12.5 x 35.0 (WxHxD), weighs 50 pounds (without battery), and is backed by a two-year warranty.

What's in the Box
Robomow RL850; 500-foot perimeter wire and 200 plastic pegs; sealed batteries and charge pack; 2007 Generation software; instruction manual.



Product Details

Product Manual [4.04mb PDF]
  • Product Dimensions: 34.5 x 13 x 26 inches
  • Shipping Weight: 102.2 pounds
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item is not eligible for international shipping. Learn More
  • ASIN: B0001ZI54M
  • Item model number: RL850
  • Average Customer Review: 3.2 out of 5 stars  See all reviews (35 customer reviews)
  • Amazon Best Sellers Rank: #333,262 in Patio, Lawn & Garden (See Top 100 in Patio, Lawn & Garden)
  • Product Warranty: For warranty information about this product, please click here


Customer Questions & Answers

Customer Reviews

Most Helpful Customer Reviews

423 of 428 people found the following review helpful By J. Cisnero on June 14, 2005
Verified Purchase
First off let me say I've seen a mix of reviews. Most of them have been positive, but a few negative ones as well.

I will discuss the negative points fully since they should be mentioned, but they are far outweighed by all of the positive things I can say about this mower, which is why I have given it four stars. I would, and should give it five stars, but I want people to know how I honestly feel and I want them to read the negative points so they can decide if this is best for them.

The subjects I will cover are setup, use, upkeep, quality, and price.

Setup (Three stars): First off, this is by far the worst section. I can see a lot of potential for someone to set their mower up in an improper fashion resulting in limited performance, but if you keep in mind that this mower is supposed to help you overcome the bulk of your yard work keep in mind it doesn't do everything.

It works as has been noted by many people by placing a wire around the perimeter of your yard. Let me say that this is best achieved by breaking your yard up into sections, especially if you have a medium to large sized yard (half to full acre).

Getting the wire just right is the hardest part, and the wire is supposed to be held in place by special plastic stakes that nail it down. The package comes with 200 of these pegs and for any good sized yard it's not nearly enough since they really need to be close together to keep the wire from becoming loose enough for the mower to snag itself on. Alternatively, you can bury the wire up to six inches into the ground which I highly recommend if you have that patience and tools.
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168 of 180 people found the following review helpful By kcobra07 on July 10, 2007
Make sure you read all of this review before making your decision. Anyone can buy a new car, toy, or appliance and be happy the first few weeks. It's the time factor that you need in making an intelligent decision about a product. Just how long does it last. That's why I try to make sure I update my review throughout the life of the product.

I have had my robomower for 3 weeks now and I love it. No more taking allergy medication before mowing for me. You put it in a dry place, let it charge and then set it out on its own. It took a good 2 days to install and it includes everything to get you running. The kit includes 200 stakes, charger, 500 feet of wire (if you need more you can use 14 guage - 500 feet - $20 from hardware store), signal unit and two signal unit connectors.

It's controlled by the installation of the wire around the perimeter of your yard. The mower will only run inside the wire. You can also break your yard into sections and put it in that section, moving it from each section when it finishes. The wire can be buried or installed with the small stakes included. Once you install the wire you connect the signal unit to the two ends of the wire from the perimeter to a small unit that sends a signal around the wire. Once the wire is installed you simply use the hand unit that looks like a ninetendo controller to drive the mower to it's starting position. Starting the mower is even easier, just press the "Go" button on the top of the unit. The mower will start by cutting around the perimeter of your yard following the wire. Then it will stay inside the wire and go back and forth cutting the grass. It makes a shape like a bunch of W's connected (WWWWWWW) when it cuts.

As you can see from the picture it looks like a little toy space ship. Little toy!?
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119 of 128 people found the following review helpful By Amazon Customer on September 29, 2004
I purchased an 850 about three months ago. My thumbnail review: good labor saving device, if you do not set your expectations too high.

This tool saves me a LOT of work. Not necessarily time, but work. I don't feel comfortable leaving Raoul (our name for our "gardener") running when I go out. It takes him about two hours to cut one of our two zones. (It takes me about an hour to cut the whole thing by hand.) So for those two hours, someone has to be home. At first, we just sat and watched him cut. Now I usually work on something else, or eat dinner, or read a book. But I have to stay home. And he does not cut in an orderly fashion. Raoul just wanders around the yard in a long, cris-crossing fashion. What he does not cut in one pass, he might get in the next. Or maybe the one after that. So if you stop him early, you will have to look for the places he has missed. But I have gotten into the habit of just turning him loose whenever I happen to be at home for the evening, which is usually at least once a week. Not a problem.

You will end up with a nice lawn. It does not get closer than a couple of inches from any vertical wall, so you will have to edge, but it cuts well and mulches much better than anything else I have used. When the lawn is done, it looks good.

It appears to be pretty safe. In my opinion, you will have to work to lose fingers, or a pet. The bottom of my Robomower is relatively flat, with three bowl shaped indents. The indents are arranged in a triangle, two in front, one in the middle behind. At the bottom (top?) of each indent, about an inch above the bottom of the mower, is a blade.
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