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Hyundai HYM40LI420P 42cm Cordless 40v Lithium-Ion Battery Lawnmower with Battery and Charger

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FREE UK DELIVERY Order by 2:30pm for same day dispatch (excludes weekends and bank holidays). Delivery in 1-2 working days.

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No cables, no petrol, no pollution: Simply charge the battery and you're ready to go

420mm / 16.5" cutting width: Ideal for small to medium-sized lawns

6 adjustable cutting heights: Get the perfect finish on your lawn

45L grass collector bag with mulching option: Minimises time spent emptying cuttings

Weighs just 19.9kg: Easy to push around the garden

Charges in just 80 mins: Provides around 15 mins of mowing time from one charge

Easy to use: Simply turn the key, press a button, pull back the OPC lever and you're off!

Foldable handles with space-saving vertical storage: Compact to transport and store

Extremely quiet-running: Minimise any disturbance to neighbours

Minimal set-up required: Get going out of the box

Peace of mind: 3 year Hyundai home-use warranty* / 1 year commercial warranty*


Cordless Lawn Mower For Small / Medium Lawns

The HYM40LI420P is a rechargeable low-maintenance lithium-ion battery-powered 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.

Battery Lawn Mower

The HYM40LI420P 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 HYM40LI420P makes mowing your lawn as easy as possible and will provide an average mowing time of 15 minutes from one charge, depending on the operating conditions.

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 HYM40LI420P 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 HYM40LI420P'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.

Push Lawn Mower

Weighing just 19.9kg, this cordless, battery-powered mower is really easy to push around your garden. This is essential for hand push models to minimise any strain or discomfort on your arms or shoulders.

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 Lawn Mower

Thanks to its incredibly quiet-running motor, the HYM40LI420P is an ultra-quiet lawn mower to minimise any disturbances to your neighbours or family.

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.

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.

What Are the Benefits of a Cordless Mower?

No cables, no petrol and no pollution - the HYM40LI420P 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 HYM40LI420P 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
  • Lightweight mower - easy to push around the garden
  • Charges from a flat battery in just 80 mins
  • Provides on average 15 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*


Battery lifespan
1000+ charges
Battery type
Lithium Ion
Catcher type
Half Plastic With Polyester Bag
Catcher volume (l)
Charging time
80 min approx.
Cut options
Rear Discharge, Mulching
Cutting height max (mm)
Cutting height min (mm)
Cutting positions
Cutting width (mm)
Deck material
For lawns up to
Small - Medium Up to 2000sq. ft
Fuel power source
Gross weight (kg)
Handle type
Soft Grip, Folding
Light cut run time
30 min
Long damp cut run time
14 min
Model ean
Motor type
Net weight (kg)
Number of batteries
Packaged dimensions
460 x 520 x 720 (H x W x L) (mm)
Product type
Lawn Mower
Quick clean hose connector
Rated power
800 W
Rear roller
Safety features
Operator Presence Control, Accidental Start Prevention Key
Start method
Voltage (v)
1 x 40
Warranty (years)
Wheel diameter (mm)
Front 152, Rear 178

Customer Reviews

Based on 1 review
Leslie Knowles
Cordless HYM40Li420P the right choice for me

After much consideration, my wife and I decided to purchase a Hyundai cordless mower, which was priced competitively. The company kept us updated on the delivery process, and the machine arrived in perfect condition a couple of days after ordering. Assembly was easy and the quality of the mower was immediately apparent - from the battery and charger to the overall solidness. I was delighted! After a full charge, I tested it on my wet, overgrown lawn and it handled the job with ease, finishing within one battery charge. It was also exceptionally quiet, and the grass box was filled without leaving any cuttings behind. I'm very pleased with the product and service from Hyundai.