20" Twin 40V Max+ Cordless Rear Roller Lawnmower

Cobra RM51SP80VX: 80V Self-Propelled Rear Roller Mower

Experience the ultimate cordless performance and professional striped finish with the Cobra RM51SP80VX. Maintaining a large, pristine lawn often feels like a trade-off between the heavy maintenance of petrol engines and the restrictive reach of a power cable. The Cobra RM51SP80VX eliminates these frustrations, offering a high-performance cordless solution specifically engineered for the British garden.

At the heart of this formidable mower is Cobra's advanced 80V brushless motor technology, powered by two 40V MAX+ Lithium-ion batteries. This twin-battery configuration delivers consistent, petrol-matching power that doesn't fade as the charge diminishes. The brushless motor provides high torque for tackling thicker grass while offering incredible efficiency and longevity. By removing the need for spark plugs and oil changes, the RM51SP80VX simplifies your routine without sacrificing performance.

Professional Striping and Versatility

Featuring a wide 51cm (20") cutting path, you can cover more ground in fewer passes. The integrated full-width steel rear roller allows you to create classic, sought-after lawn stripes. Beyond aesthetics, the roller provides essential stability when mowing right up to the edge of flowerbeds, preventing the "scalping" often seen with four-wheeled mowers. With six cutting heights ranging from a fine 17mm finish to a robust 75mm, you can adapt to any grass condition with a single lever.

Operator Comfort and Ergonomics

Operator comfort is paramount when managing larger estates. The self-propelled drive system takes the physical strain out of mowing, propelling the machine forward so you simply need to guide it. Its lightweight, well-balanced steel chassis reduces user fatigue, while the handles feature infinite angle adjustments to suit users of any height. When the job is done, the cam-lock folding handles allow for compact storage.

Safety and Collection Efficiency

The RM51SP80VX features a massive 70-litre grass collection bag made from high-quality fabric, which improves airflow and collection efficiency—even in damp conditions. An integrated grass-full indicator lets you know exactly when it’s time to empty. For added peace of mind, the battery compartment is securely housed, and the simple push-button start means you can get to work instantly without the physical exertion of a recoil pull-start.

Main Features

• 80V Power System: Twin 40V MAX+ Lithium-ion batteries with a high-torque brushless motor.

• Self-Propelled Drive: Effortless movement across uneven terrain or large lawn areas.

• 51cm Steel Deck: Robust, high-quality construction for long-term durability.

• Full-Width Steel Rear Roller: Creates traditional stripes and allows for easy border mowing.

• 6-Stage Height Adjustment: Single lever central adjustment ranging from 17mm to 75mm.

• 70-Litre Grass Collector: Large capacity fabric bag with a hard lid and fill indicator.

• Quick-Release Handles: Cam-lock folding system for compact vertical storage.

• Complete Kit: Includes 2 x 40V 4.0Ah batteries and 2 x fast chargers as standard.

40V MAX+ BATTERY SYSTEM

Built into the battery pack, this smart system recognises the specific Cobra tool in use and optimises output for peak efficiency. 40V Max+ batteries are high-performance, long-running, and fast-charging—and one battery fits all tools in the range. The Cobra RM51SP80VX uses twin 40V Max+ batteries to deliver a powerful 80V of performance, ensuring longer run times and the strength to tackle tougher mowing tasks with ease.

51cm / 20" CUTTING DECK

The Cobra RM51SP80VX is equipped with a robust 20" (51cm) steel cutting deck, built for durability and high-performance mowing. This wider deck, paired with a precision-engineered blade, delivers a clean and consistent cut with every pass. Ideal for larger lawns, the 51cm width offers excellent coverage while still allowing for confident control—perfect for achieving a crisp, professional striped finish.

BEAUTIFUL STRIPED FINISH

Equipped with a full-width rear roller, the Cobra RM51SP80VX is built to deliver a classic striped finish across larger lawn areas. The 20" (51cm) cutting width combined with the rear roller gives your garden a professional, well-defined look, while also enhancing stability when mowing along borders and edges. This allows you to mow confidently right up to flowerbeds and pathways, helping you maintain crisp, clean lawn stripes with ease.

17-75mm CUT HEIGHTS

With a fully adjustable 6-stage cutting height range from 17mm for a precise low finish, up to 75mm for tackling longer, more demanding grass, the Cobra RM43SP40VX delivers the versatility needed for various lawn conditions and cutting preferences. Adjusting the height is quick and effortless using the single height-of-cut lever, conveniently located next to the rear roller. This user-friendly design makes it easy to achieve your desired finish with confidence and control.

ERGONOMIC CONTROLS

The Cobra RM51SP80VX offers smooth handling and effortless control, even across larger lawns and more challenging terrain. Its balanced design and powerful self-propelled drive system reduce operator fatigue, maintaining a consistent pace with minimal effort. The ergonomically positioned controls ensure comfortable operation, allowing you to confidently manoeuvre around borders, flower beds, and lawn edges. Designed for both performance and ease.

SELF-PROPELLED DRIVE

The Cobra RM51SP80VX offers effortless control and smooth, consistent handling, even across larger lawns and more demanding terrain. Its balanced design and powerful self-propelled drive system reduce operator fatigue, helping you maintain a steady pace with minimal effort. Whether you're mowing around borders, flower beds, or lawn edges, this mower delivers the precision and stability needed to achieve a flawless finish.