Cobra RM4140V 40V Li-Ion Cordless Rear Roller Lawn Mower (with 4Ah Battery & Charger)
RRP: £385.00
OUR PRICE: £359.99 (inc VAT)
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A welcome addition to the Cobra 40V li-ion range is the new RM4140V lawn mower. What is so special and totally unique about this model is that it is equipped with a full width rear roller. For the first time, you can achieve a traditional striped finish on your lawn with a battery-powered lawn mower. The roller also gives you the ability to mow right up to the edge of flowerbeds and borders.

The quality metal deck with a cutting width of 41cm (16") features seven fully adjustable cutting heights ranging from 25mm for a superb low finish, up to 75mm for tackling longer grass. Grass clippings are collected into a generous 50 litre fabric grass bag.

The Cobra RM4140V is hand-propelled and powered by a 4Ah 40V Samsung lithium-ion battery. The mower will run for up to 30 minutes (in ideal cutting conditions) on a single 90 minute charge.

The Samsung 40 volt lithium-ion battery offers a quiet yet powerful and lightweight combination, is an environmentally-friendly alternative to a petrol-powered lawn mower and gives you the freedom to mow without the restraints of an electric power cable. A built-in battery power indicator allows easy monitoring of battery life. 

Product specification

Brand: Cobra
Battery: 1 x Samsung lithium-ion
Battery Voltage: 40V
Battery Capacity: 4Ah
Battery Charger: Included
Battery Charge Time: Approx 90 mins
Rapid Charge Time: 80% charge in 45 mins
Approx Run Time: 30 mins (with 4Ah battery)
Start Method: Push button
Propulsion: Hand-propelled
Width of Cut: 41cm / 16"
Minimum Cutting Height: 25mm
Maximum Cutting Height: 75mm
Cutting Height Adjustment: Central, 7 stages
Collection System: Fabric grass bag with hard lid
Collector Capacity: 50L
Handle Type: Folding
Rear Roller: Yes
Weight Without Battery: 21.64
Warranty: 2 years
40v li-ion battery

40V lithium-ion battery expertly powering Cobra lawn mowers

The 4Ah Samsung 40v lithium-ion battery offers a quiet, yet powerful and lightweight combination. Lithium-ion technology means the tool is always ready to use, suffers no self-discharge and has no memory effect.

A closer cut with Cobra

Cobra lithium-ion cordless lawn mowers feature seven cutting heights ranging fro 25mm to 75mm, achieved by simply using the single lever height of cut adjustment lever which has been conveniently positioned next to the rear wheels.

Battery power indicator 


Easily monitor your li-ion battery life with the battery power indicator

The cordless lawn mower comes equipped with a battery power indicator which is conveniently located between the handles. By simply pressing the power button, LED lights will give the operator a visual display of how much power is left in the lithium-ion battery.

50 litre grass bag

Large capacity grass bag for increased collection

The 50 litre grass bag is ideal for collecting large amounts of grass clippings before the need for emptying. The grass bag is made from a robust, high quality fabric which enables a strong free flow of air for even more compact and comprehensive grass collection.

2 year warranty

2 year warranty

Cobra battery-powered lawn mowers are covered by a two year manufacturer's warranty.


Cobra banner lawnmower

Cobra Garden - The Most Comprehensive Range of Garden Machinery in the UK

Cobra Garden Machinery was launched in 2013 and is supported by Henton & Chattell Ltd, giving Cobra Garden the benefit of over 85 years experience in the garden machinery and horticultural Industry.

The Cobra Garden range is constantly expanding and now consists of over 130 products to cover both your domestic and professional requirements. Cobra incorporates a comprehensive range of petrol, electric and cordless lawn mowers, hand-held machines and lawn care products. Cobra Garden products are available across the UK throughout a network of approved specialist dealers. As a Cobra Garden approved dealer, The Green Reaper has the knowledge and experience to help you purchase the correct Cobra Garden product for your requirements. We will also provide expert after-sales assistance if needed.

Cobra Garden’s philosophy is to remain true to its trusted values of innovation, quality, reliability, value and customer service. Cobra Garden works hard to ensure that the products and services on offer continue to be relevant to its customers.


View Cobra brochure

Add review
4.6 Star Rating
Jun 03 2020
Works OK, assembly instructions are not very clear. Not sure the roller is very effective at making stripes (which was why I bought this model) but grass isn't growing much at the moment
May 26 2020
Andrew Cruise
I'm pleased with the Cobra RM4140V Cordless Lawn Mower. It cuts the grass well. It create stripes. It is a bit lighter than a petrol equivalent. It is quieter than a petrol mower, which I was surprised by as the quoted dB didn't seem low. I find charging the battery a lot more straight forward than buying and filling up with petrol. I also feel more at ease about stopping and starting repeatedly than I did with a petrol mower as it is so easy pressing a button rather than pulling a cord. Of course it doesn't produce the fumes of a petrol mower. It is not as maneuverable around objects as I would like but I suspect that's a trade off you except, to have the longer blade size allowing you to get the big areas done quickly and turning at the end of straight lines is easy enough. I am happy with it and would recommend it for a medium size lawn
Apr 24 2020
Ian Hiscutt
This is a great mower! My last mower (petrol) lasted 25 years and this Cobra machine is a perfect (green) replacement. It's well made and works fine! Importantly, it has a roller and can cut very low to very high and this covers all my needs. Very well packaged and prompt delivery from the Green Reaper!
Jul 22 2019
Terry McGill
Bought as a replacement for my Petrol lawnmower. Excellent Company Excellent Price Would buy again from the Green Reaper
Jun 14 2018
Wanted a cordless rear roller inexpensive mower to supplement a robotic mower for doing edging and occasional trimming grass if too long. Cobra RM 4140V fits this requirement. Promptly delivered and adequately packaged. The Green Reaper was very helpful.