Cobra MX51S40VX 40V MAX+ 3-in-1 Self-Propelled Cordless Lawn Mower (with 2 x 40V 4Ah Batteries & Standard Charger)
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Cobra doesn't do things by halves with this superb addition to its range of second generation, environmentally-friendly cordless lawn mowers which is sure to be another award winner.
The MX51S40VX MAX+ lithium-ion lawn mower delivers powerful, low-maintenance lawn care with clean, cordless performance. Capable of taking twin 40V MAX+ batteries in its dual port battery housing, the lawn mower's brushless motor draws from one battery at a time giving double the run time. This self-propelled mower features a 51cm (20”) cutting width and seven-stage height adjustment (25–75mm) via a single lever. Its robust steel deck, front grass combs, and 60 litre grass bag ensure efficient operation, while mulching and side discharge options add versatility. Weighing 30.4kg, it’s built for easy handling and reliable results.
Proud to be supporting the cordless evolution, Cobra battery-powered mowers are packed with innovative features to help you maintain your lawn with the minimum of effort in the most environmentally-friendly way. Petrol-matching power without the noise, fuss, mess and fumes of petrol or the restriction of an electric power cord.
NB: 2 x 4.0Ah batteries and standard charger INCLUDED.
Important: 40V MAX+ batteries are NOT compatible with Cobra's original 40V machines.
Cobra’s 40V cordless machines have evolved .... introducing the 40V MAX+ lithium-ion battery system, the ultimate solution for power, convenience and eco-friendly gardening.
The Cobra 40V MAX+ batteries are a step ahead of the competition in terms of technology and innovation. This advanced intelligent battery technology manages power efficiency to deliver optimal performance and longer run time. Build directly into the battery pack, this smart system allows the battery to recognise the specific Cobra tool it is being used with, automatically optimising output for peack efficiency.
The 40V MAX+ batteries offer several advantages: one battery fits all 40V MAX+ tools, they deliver high-performance power, run longer, and recharge faster. This advanced lithium-ion technology powers a comprehensive range of garden tools, including lawn mowers, strimmers, blowers, chainsaws, and a versatile multi tool.
With Cobra’s 40V MAX+ battery system, you can enjoy long-lasting power and quick recharging, making your gardening experience a pleasure.
One battery, endless potential. Future-ready power, today.
BATTERY COMPATIBILITY
This mower is exclusively compatible with Cobra's 2nd Generation 40V MAX+ range introduced in 2025.
Tools, batteries and chargers from Cobra's 1st Generation 40V Original range are NOT compatible with the 2nd Generation 40V MAX+ range.
| Brand | Cobra |
|---|---|
| Battery Housing | Twin port |
| Battery | 2 x 40V MAX+ lithium-ion (included) |
| Battery Voltage | 40V |
| Battery Capacity | 4Ah |
| Battery Charger | 2A VX standard charger (included) |
| Motor | Brushless |
| Start Method | Electric, push button |
| Propulsion | Self-propelled single speed |
| Width of Cut | 51cm / 21" |
| Cutter Deck | Steel |
| Minimum Cutting Height | 25mm |
| Maximum Cutting Height | 75mm |
| Cutting Height Adjustment | Central, 7 positions |
| Collection System | Fabric grass bag with hard lid |
| Collector Capacity | 60L |
| Fill Level Indicator | Yes |
| Grass Combs | Front |
| Side Discharge | Yes |
| Mulch Plug | Included |
| Handle Type | Folding |
| Rear Roller | No |
| Warranty | 2 years for domestic use |
| Promotional Image | /c/o/cobra-40v-max-lithium-ion_8_1.jpg |

40V MAX+ battery systemBuilt directly into the battery pack, this smart system allows the battery to recognise the specific Cobra tool it’s being used with, automatically optimizing output for peak efficiency. The 40V Max+ batteries offer several advantages: one battery fits all 40V Max+ tools, they deliver high-performance power, run longer, and recharge faster. The Cobra MX51S40VX lawn mower boasts a dual port battery port enabling it to house two 40V MAX+ batteries. |
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51cm / 20"cutting deckThe Cobra MX51S40VX lawn mower boasts a sturdy 51cm cutting deck, ideal for medium to large sized lawns. This deck size ensures efficient and precise mowing, delivering a clean, even cut with every pass. The 20" width perfectly balances maneuverability and coverage, allowing you to easily navigate around obstacles. |
Self-propelled driveThe Cobra MX51S40VX comes equipped with a self-propelled drive system for added comfort and ease of operator use. The self propelled system takes all the effort out of pushing your lawn mower, meaning you can maintain your lawn with ease. This feature is especially beneficial for users who want to reduce the physical strain of mowing large lawns or uneven terrains. |
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25-75mm cut heightsFor those seeking precision and flexibility in lawn care, the Cobra MX51S40VX is an ideal choice. It features a fully adjustable cutting system with seven distinct height settings, allowing you to effortlessly tailor the cut to suit your lawn’s needs - from a close trim at 25mm to tackling longer, more unruly grass at up to 75mm. Switching between these settings is quick and hassle-free, thanks to the mower’s convenient single height-of-cut lever, enabling smooth adjustment with minimal effort. |
Mulch & side dischargeThe MX51S40VX cordless lawn mower from Cobra comes equipped with a mulch plug, allowing you to mulch your grass clippings back into the lawn for a healthier, greener finish. Mulching lawnmowers work by finely cutting and re-cutting the clippings, returning valuable nutrients to the soil. The MX51S40VX also offers the versatility of side discharge, using the side discharge chute to efficiently expel clippings to the side - ideal for tackling longer or more dense grass where collection isn’t practical. |
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'Trim Cut': Front grass combsThe Cobra MX51S40VX is engineered for superior cutting performance and is equipped with innovative front-mounted grass combs. These specially designed combs work by gently lifting and aligning the grass blades before they reach the cutting deck, ensuring they are positioned perfectly for an even and precise trim. By guiding the grass into the path of the blades, this advanced feature not only enhances cutting efficiency but also contributes to a cleaner, neater finish. |
Handle angle adjustmentThe Cobra MX51S40VX is thoughtfully designed with user comfort in mind, featuring three adjustable handle angle settings. This allows operators of all heights to customise the handle position to suit their individual needs, ensuring a more comfortable and ergonomic mowing posture. Additionally, the soft-grip handles provide enhanced comfort by reducing vibration and hand fatigue, resulting in a smoother, more controlled operation. |
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ABOUT COBRA GARDEN.....

Cobra Garden - The Most Comprehensive Range of Garden Machinery in the UK
Cobra garden machinery was launched in the United Kingdom in 2013 and is supported by Henton & Chattell Ltd, giving Cobra the benefit of over 90 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.

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