Cobra RM4140V Review – Cordless Lawnmower

Cobra RM4140V Cordless Lawnmower Review
Cobra RM4140V
Performance/Cut Quality
87
Features
91
Durability
92
Value
84
Warranty/Support
84
What I Like
Great for small to medium gardens.
Very well made piece of equipment.
Reliable Battery
Good range of cutting heights.
User friendly design and easy to assemble.
Folds for storage.
Rear roller for a striped lawn.
What I Don't Like
No self propelled drive.
No mulching option.
88
My Overall Rating

Summary

Cobra RM4140V LawnMower Review

Cordless lawn mowers are an excellent addition to the garden if you’re looking for freedom when mowing and no emissions. Modern models like the Cobra RM4140v cordless rear roller lawn mower are powerful and packed with exciting features that make mowing the lawn less of a chore.

With seven cutting heights, the Cobra RM4140v cordless rear roller lawn mower is a versatile machine that’s got a cutting width of 41 cm making it ideal for small to medium gardens.

If you’ve struggled with the weight of a petrol lawn mower, then the lightweight and manoeuvrable design of the Cobra RM4140v cordless rear roller lawn mower will be a welcome change.

With a rear roller for that beautiful striped effect and a user friendly design, there isn’t much to complain about when it comes to this lawn mower. In my Cobra RM4140v cordless rear roller lawn mower review, I’ll talk about the various features and help you decide if this is the right mower for your garden.

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Main Features

  • 41 cm cutting width
  • 7 cutting heights
  • Rear roller for striped lawn
  • 50 litre grass catcher
  • 4.0Ah 40v Samsung lithium ion battery
  • 90 minute charging time
  • 30 minute run time
  • 2 year warranty

Power System & Batteries

Cobra RM4140V Power System & Batteries

The Cobra RM4140v cordless rear roller lawn mower comes with a single 4.0 Ah 40 v lithium ion battery manufactured by Samsung so you know you’re getting something from a reputable brand.

This is a fair amount of power for a lawn mower of this size which means that you’ll benefit from excellent performance and reliability.

You’ll also receive a single battery charger which will refill the battery power in as little as 90 minutes. Once fully charged, the battery offers a 30 minutes run time which should be sufficient for lawns up to 400m².  However, if you’re in a hurry, this may be too long to wait but Cobra also makes two (slightly larger) versions of this model; the RM43SP80v and the RM51SP80v that come with a dual fast charger, decreasing the charging time and raising the mowing time. More on that later!

What’s great about the battery is not only is it reliable but it also won’t self discharge. Once you’ve charged it, you can store it away with the peace of mind that you won’t come to mow the lawn and have to hook it up to power again.

Performance 

One thing that stood out to me when looking at customer reviews of the Cobra RM4140v cordless rear roller lawn mower was how well it performs. Even on longer grass, it glides effortlessly over the lawn. So, while it doesn’t have a self propelled drive, it is relatively easy to manoeuver and you’ll get a decent cut.

The running time on this model is around 30 minutes although this will vary depending on the conditions. The more challenging the terrain and grass length or density, the more power the Cobra RM4140v cordless rear roller lawn mower will need to use.

If you’ve got a slightly more challenging lawn, you might find the Cobra RM41SP80v or its larger brother, the Cobra RM51SP80v better as they have a 50 minute and 40 minute running time respectively plus both have a self propelled drive. I’ve review both of these models if you’d like more information.


Cobra RM4140V Video Review

To give you a visual representation of the Cobra RM4140V please watch the following video review below:

 


Features In Detail

Deck and Blade

The Cobra RM4140v cordless rear roller lawn mower benefits from a metal deck which makes it incredibly robust compared to other cordless lawn mowers. Again, if the terrain is slightly more challenging, this design element eliminates the need to worry about damage.

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Height Adjustment

Cobra RM4140V Height Adjustment

The cutting height options on the Cobra RM4140v cordless rear roller lawn mower range between 20mm and 75mm so there’s a good degree of versatility here which is essential with the changing seasons.

However, if you want an even closer cut then the 43 cm and 51 cm models have a lower cutting height setting of 17 mm.

Changing the cutting height is so simple thanks to a conveniently located lever just by the rear wheels. All it requires is moving the lever into position and getting on with the job. It takes seconds.


Cutting Diameter

With a 41 cm cutting deck, the Cobra RM4140v cordless rear roller lawn mower is designed for a small to medium sized lawn. The manufacturer recommends lawns up to 400m² for this model although the two larger models, with their 43 cm and 51 cm decks are ideal for gardens up to 500m² or 600m².


Handles

I always think it’s important to pay attention to the handles on your lawn mower. While they may not play a role in the quality of the cut, they are essential to your comfort.

The Cobra RM4140v cordless rear roller lawn mower features an ergonomically designed handle with grips so it’s much more comfortable, especially during a longer mowing session.

I also really like that the battery power indicator is conveniently located at the top of the handle so you can always keep an eye on how much juice is left.

What’s more, the handles fold down so you can reduce the overall size of the mower for easier storage. That said, I have read reports that the handles aren’t super easy to fold down and could benefit from a quick release mechanism. Still, I don’t think this should be a point that puts you off buying the Cobra RM4140v cordless rear roller lawn mower.


Cobra Cordless Lawn Mower Comparison

ModelCobra RM4140VCobra RM43SP80VCobra RM51SP80V
Imagerm4140vRM43SP80VRM51SP80V
Power40V80V80V
Battery1x 4.0Ah2x 5.0Ah2x 5.0Ah
Battery Charge Time90 Minutes30 Minutes30 Minutes
Charger Supplied1x Standard2x Fast2x Fast
Mowing Time30 Minutes50 Minutes40 Minutes
Lawn Size400m²500m²600m²
Deck Size41cm (16")43cm (17”)51cm (20”)
Deck MaterialPolymer DeckMetal DeckMetal Deck
Rear Roller

No. Cutting Heights667
Cutting Height20-75mm17-75mm17-75mm
Grass Collector50L50L60L
Weight20kg28kg33kg
Self-propelled

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Roller (Stripes)

One of the major selling points of the Cobra RM4140v cordless rear roller lawn mower is the rear roller. This model is remarkably similar to the Cobra MX4140v but the rear roller sets the two apart.

If you’re looking to create that traditional striped effect (or any other mowing pattern) then this is an essential feature. Plus, according to user reviews, the roller does an excellent job at creating defined, neat stripes.


Grass Collection Box

Cobra RM4140V Grass Collection Box

The Cobra RM4140v cordless rear roller lawn mower comes with a large 50 litre grass catcher which I think is very generous for this size of mower. Again, I should mention that the larger 51 cm model comes with a 60 litre grass box and the beauty of this is that you don’t need to stop to empty as often.

The grass box on the Cobra RM4140v cordless rear roller lawn mower is a hybrid model with fabric sides and a plastic lid.

The fabric body of the box means that air flow is increased so more clippings can be stored before it needs to be emptied. With the plastic lid, there is greater structure and stability so while the sides are fabric, it doesn’t feel at all flimsy. When you’re done mowing, the box can be easily folded, reducing the need for a ton of storage space.

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Cutting Diameter

With a 41 cm cutting deck, the Cobra RM4140v cordless rear roller lawn mower is designed for a small to medium sized lawn. The manufacturer recommends lawns up to 400m² for this model although the two larger models, with their 43 cm and 51 cm decks are ideal for gardens up to 500m² or 600m².


Practicalities

The Cobra RM4140v cordless rear roller lawn mower is designed to be a lightweight lawn mower and weighs just 23kg without the batteries. This is a huge difference to some of the petrol lawn mowers out there and if you’re switching to cordless to reduce your carbon footprint, this difference in weight won’t be something that goes unnoticed.

Another great thing about the Cobra RM4140v cordless rear roller lawn mower is how easy it is to assemble. Most people manage to put it together in less than 15 minutes so there’s no messing around once you get it out of the box. Plus, if you do happen to run into any problems, there is a great YouTube video that makes it even easier.

I really like that the Cobra RM4140v cordless rear roller lawn mower is designed in the UK and is so well made. It feels incredibly robust although the battery compartment is a little flimsy but the main body of the mower is very stable.

You get a 2 year warranty and that’s pretty standard with lawn mowers but it’s still long enough to give you the peace of mind that you need. Plus, the customer service is based in the UK which always makes things easier.

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Cobra RM4140V Cordless Lawn Mower User Manual

You can download the Cobra RM4140V  Cordless Lawn Mower user manual guide here.


What’s Included in the Box

  • 1 x Cobra RM4140v cordless rear roller lawn mower
  • 50 litre grass box
  • Single battery charger
  • 1 x 4.0Ah 40v Samsung lithium ion battery
  • User manual

Pros and Cons

Pros
  • Great for small to medium gardens.
  • Very well made piece of equipment.
  • Reliable battery.
  • Good range of cutting heights.
  • User friendly design and easy to assemble.
  • Folds for storage.
  • Rear roller for a striped lawn.
Cons
  • No self propelled drive.
  • No mulching option.

 


Should You Buy the Cobra RM4140v ?

If you’re in the market for a cordless lawn mower that’ll make life easier then I think that the Cobra RM4140v cordless rear roller lawn mower would be a worthwhile choice. Yes, it is pretty pricey but as they say, you get what you pay for.

The build quality is excellent so for those of you looking for a durable piece of garden equipment, it’s a must. What’s more, with a clean cut on the first pass, it’s an ideal choice for people who don’t want to have to spend longer than necessary looking after their lawn.

The Cobra RM4140v cordless rear roller lawn mower is designed for small to medium gardens up to 400m² but if your lawn is larger than this then there are two bigger models with a 43 cm or 51 cm cutting width. What’s more, these larger models are equipped with a single speed self propelled drive so if you find pushing a lawn mower around a little tiresome, they might be a good alternative.

 


Conclusion

The Cobra RM4140v cordless rear roller lawn mower is a convenient and easy to use mower that takes the stress out of mowing the lawn. While there are a couple of minor drawbacks, on the whole, this is an excellent piece of equipment.

It’s robust and extremely well made and comes with all the basic features you need to make lawn mowing a breeze. For the everyday gardener, looking for a good eco-friendly alternative, the Cobra RM4140v cordless rear roller lawn mower has it all.

With powerful and reliable batteries, there’s no need to worry about running out of juice halfway through the mow and with no risk of self discharge, you can come back to the batteries and simply get on with the job.

Overall, the Cobra RM4140v cordless rear roller lawn mower is a great investment for anyone looking for a reliable and modern mower.


Where Should I Purchase This Model

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Cobra RM4140V 41cm (16in) Cordless Battery Lawnmower with Rear Roller...
  • 40V Li-ion BATTERY - The Cobra RM4140V is powered by a Samsung 40V Lithium-ion battery offering a quiet, yet powerful and lightweight combination. The Cobra 40V Lithium-ion technology means the tool is always ready to use, suffers from no self-discharge and has no memory effect.
  • A CLOSER CUT - With a fully adjustable 7 cutting heights ranging from 20mm for a superb low finish, up to 75mm for tackling longer grass, choose the Cobra RM4140V. All this is achieved by simply using the single height of cut adjustment lever which has been conveniently positioned next to the rear wheels.
  • EASILY MONITOR YOUR BATTERY LIFE - The Cobra RM4140V Li-ion cordless lawnmower comes equiped with a battery power indicator which is conveniently located between the handles at the top of lawnmower.
  • COLLECTION SYSTEM - The Cobra RM4140V cordless lawnmower is equipped with a 50ltr fabric grass bag, ideal for collecting large amounts of grass clippings before the need for emptying. The grass bag on the Cobra RM4140V is made from a robust, high quality fabric. This fabric enables a strong free flow of air which means that grass collection on this machine is even more compact and comprehensive.
  • 2 YEAR DOMESTIC WARRANTY - Weight: 21.64kg (Without Battery)

Last update on 2024-07-12 / Affiliate links / Images from Amazon Product Advertising API


Not sure about this mower? Click here to see more Cordless Lawn Mower Reviews.

Mark Haley Author
Lawnmower Product Expert, Reviewer and Author at EasyLawnMowing.co.uk | 01284 615144 | info@easylawnmowing.co.uk | Website

As a seasoned expert in the field of garden power tools, I have dedicated over a decade to working with and reviewing a wide variety of lawn mowers. My extensive experience has allowed me to gain a deep understanding of the benefits and limitations of different types of mowers and garden tools.

Over the years, I have honed my skills in writing informative articles and creating helpful videos for various blogs and publications. This has given me the ability to not only recognise what makes a good lawn mower, but also to help you choose the perfect garden tool for your specific needs and requirements.

With my wealth of knowledge and expertise, I am confident that I can provide you with valuable insights and recommendations when it comes to selecting the right lawn mower for your lawn. So, whether you're looking for a battery cordless, electric, petrol, or robotic mower, you can trust in my expertise to guide you towards the best option for your garden.

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