Hyundai 16.5'' / 42cm 40v Cordless Self-Propelled Lawnmower 2.5Ah Li-Ion Battery | HYM40LI420SP

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£349.99 inc. VAT
£291.66 ex. VAT
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Orders to be received within 1 - 5 working days. There may be a slight delay in courier tracking becoming available. Postcode exclusions apply.

4 months at 0% interest, Click for more info

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Cordless Lawn Mower For Small / Medium Lawns

The HYM40LI420SP is a rechargeable low-maintenance lithium-ion battery-powered self-propelled lawn mower from Hyundai. The ideal battery-powered lawn mower for small to medium-sized lawns, this mower will bring you a clean, green, cable-free mowing experience.

Self-Propelled Petrol Mower

This battery-powered mower also features a self-propelled system - no pushing required! Mowing has never been easier.

Battery Lawn Mower

The HYM40LI420SP mower features a powerful 40v motor and comes complete with a 40v battery and charger. The battery has a handy indicator light allowing you to see exactly how much battery life is remaining. There is also a spare battery compartment within the mower that allows you to store a fully charged spare battery (sold separately) so you can swap batteries if required.

With a charging time of just 80 minutes and a battery lifespan of 1000+ charges, the HYM40LI420SP makes mowing your lawn as easy as possible and will provide an average mowing time of up to 60 minutes from one charge, depending on the operating conditions.*

Run Time (No Load) - Up to 60mins
Run Time (Light/Dry Conditions) - Up to 40mins
Run Time (Heavy/Wet Conditions - Up to 20mins

420mm Cutting Width

With an cutting width of 420mm / 16.5", this mower is ideal for small to medium-sized lawns and gardens.

For the perfect, tailored cut on your lawn, the HYM40LI420SP can be easily adjusted between its 6 different cutting heights - ranging from 25mm for a super smooth lawn to a 75mm option if you’re trimming rougher ground or doing a first cut - by using a single height adjusting lever, giving you complete control over your lawn care needs.

The HYM40LI420SP's spacious 45L grass collector bag, featuring a high airflow and hard lid, ensures that you'll spend less time having to empty the cuttings and thus reducing your overall mowing time.

This cordless lawn mower comes with a mulching plug option, where your dropped cuttings become compost, creating a healthier-looking, lush, green lawn.

Lightweight Lawn Mower

Weighing just 19.9kg, this cordless, battery-powered mower is really easy to move around your garden.

Using this powerful mower couldn’t be easier - simply insert the safety key, engage the lock-out button and pull back the OPC (Operator Presence Control) lever. This easy-starting method removes any of the strain associated with petrol recoil pull-start lawn mowers.

Compact and Quiet

Thanks to its incredibly quiet-running motor, the HYM40LI420SP is an ultra-quiet lawn mower to minimise any disturbances to your neighbours or family.

It’s quick and easy to assemble out of the box, allowing you to get it in your garden for the first cut in no time at all. With no engine to service, you also don’t need to spend time checking oil, air filters or spark plugs, making it extremely easy to maintain.

This lawn mower is so compact to store and transport. Thanks to its clever design, its handles fold down over the main power unit, which saves space in your garden shed or garage. On top of this, it is also able to be stood upright for a compact storage solution when space is limited.

What Are the Benefits of a Cordless Mower?

No cables, no petrol and no pollution - the HYM40LI420SP lawnmower is powered by a market-leading 40v lithium-ion 2.5Ah battery, which means no more messy fuel to have to deal with and no dangerous mains cables - mowing the lawn has never been easier or safer.

3 Year Warranty

As with all of our Hyundai Lawn Mower range, the HYM40LI420SP comes with our Hyundai 3 year platinum home-use warranty* / 1 year commercial warranty* (terms apply) for added peace of mind.

At A Glance:

  • 420mm/16.5” cutting width for small to medium gardens
  • Self-propelled so drives itself - no need to push!
  • Charges from a flat battery in just 80 mins
  • Provides on average 30 minutes of cutting time (depending on conditions)
  • 6 adjustable cutting heights – 25-75mm
  • 45L grass collector
  • Foldable handles for compact storage
  • Really quiet running
  • 3 year home-use warranty* / 1 year commercial warranty*
*Cutting time depends on many factors, such as how level the ground is, the thickness of the grass, the exact model of our 40v machinery, cutting conditions and weather. Please use our run time estimates for guidance only as these can vary.


Model HYM40Li420SP
Start Method Battery
Propulsion Self-Propelled
Cutting Width (mm) 420
Cutting Height Min (mm) 25
Cutting Height Max (mm) 75
Cutting Positions 6
Cut Options Rear Discharge, Mulching
Catcher Volume (L) 45
Catcher Type Half Plastic With Polyester Bag
Handle Type Soft Grip, Folding
Safety Features Operator Presence Control, Accidental Start Prevention Key
Deck Material Steel
Quick Clean Hose Connector No
Number of Batteries 1
Battery Type Lithium Ion
Voltage (v) 1 x 40
Charging Time (mins approx.) 80
Light Cut Run Time (mins) 40
Long/Damp Cut Run Time (mins) 20
Battery Lifespan (charges) 1000+
Rated Power (w) 800
Motor Type Brushless
Gross Weight (kg) 26
Net Weight (kg) 19.9
Wheel Diameter (mm) Front 152, Rear 178
Fully Assembled Dimensions (H x W x L) (mm) -
Package Dimensions (H x W x L) (mm) 460 x 520 x 720
Fuel/Power Source Cordless
Rear Roller? No
Recommended For Lawns Up To Small - Medium Up to 2000sq. ft
Product Type Lawn Mower
Warranty (years) 3
Model EAN 5056275759155
In The Box HYM40LI420SP Battery Powered Lawnmower 45L Hard Top Grass Collector 40v Rechargeable Lithium-Ion Battery Battery Charger 2x Safety Keys & User Manual

9 Reviews Hide Reviews Show Reviews

  • 4
    Hyundai battery powered self drive lawnmower

    Posted by David Corbett on 14th Jul 2023

    Excellent next day delivery easy to assemble self drive and battery power is a bonus.

  • 5
    What a great mower

    Posted by Mark Walker on 6th Jul 2023

    Brought this to replace My petrol lower what a great easy mower to use well impressed with it

  • 5
    Hyundai 42cm Cordless 40v Lithium-Ion Battery Self-Propelled Lawnmower

    Posted by Gideon Visser on 5th May 2023

    Next day delivery, and easy to assemble. Battery charged quickly, and the mower started. I havde not mowed the lawn yet, but it seems to move easily and I feel that it will mow very well

  • 5

    Posted by Peter Axon on 16th Apr 2023

    easy to assemble cut my medium sized lawn on one charge

  • 5
    Lawnmower cordless self drive

    Posted by Gordon Millard on 14th Apr 2022

    Ordered on Tuesday delivered on Wednesday grass cut in just after delivery, superb service the machine is very good battery only half used for over 200m of grass very pleased so far.

  • 5
    Pleased with it

    Posted by CHRIS WHITE on 6th Apr 2022

    Received this morning and just mowed the grass - all seems good. Easy to assemble. Battery lasted well - mowed all my grass with juice to spare. Light to move around and easy to change cutting height. Glad I bought it!

  • 4

    Posted by Derrick Gurney on 3rd Oct 2021

    Prompt delivery and easy to set up. Only needed to attach handle. Have only used once so far but cut the lawn well. Quicker than my previous mower as this one has a wider cut. Self propelled facility was of great benefit.

  • 4
    Great machine

    Posted by PW New Forest on 9th Mar 2021

    Easy to order on website, next day delivery. Used for the first time yesterday and was delighted I was able to mow front and backn on one battery charge. Mower goes at a careful pace for an aged user and grass packs well into the collector, good first cut. Undecided whether to get a spare battery as seem rather expensive, not sure if the battery or I will wear out first. A good machine glad I purchased it.

  • 4
    Very quick delivery

    Posted by PW New Forest on 3rd Mar 2021

    I ordered this on the Friday and it was delivered by DPD on the Saturday. Easy to put together even for an OAP. I have been unable to use yet as grass too wet but looks a good buy

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