Best Cordless Lawn Mowers UK 2026: Tested & Compared
The best cordless lawn mowers for UK gardens in 2026, tested and compared. Top picks from Hyundai, Mountfield, LawnMaster and Webb - plus a buying guide covering battery voltage, run-time and lawn size.
Key takeaways
- The Hyundai HY40CLM38 runs on twin 20 V batteries wired in series for 40 V performance, which is where cordless mowers start feeling genuinely comparable to petrol.
- The Mountfield Electress 34 Li weighs under 12 kg with the battery fitted, which makes it one of the easiest mowers on this list to lift onto a patio or up a step.
- The LawnMaster MX 24V is the cheapest mower we would genuinely recommend.
- If you want cricket-square stripes without a petrol cylinder mower, the Webb WEV2012RB4 is one of the only cordless cylinder mowers on the UK market.
- As a UK guide: A 40 V / 4 Ah battery will typically mow for around 40 minutes on flat, dry grass.
Cordless lawn mowers have finally caught up with petrol on most UK lawns. Battery tech is lighter, run-times are longer, and prices have dropped sharply. If you want a quiet, low-maintenance mower that starts on the first pull of a trigger, 2026 is a great year to switch.
Below are our current top picks based on hands-on reviews, real UK buyer feedback and value for money. Every mower listed is one we have reviewed in full, click through for the deep-dive, specs and price checks.
Our top cordless lawn mowers for 2026
| Model | Best for | Cutting width | Battery |
|---|---|---|---|
| Hyundai HY40CLM38 | Best overall - medium lawns | 38 cm | 40 V (2 x 20 V) |
| Hyundai HY20CLM33 | Best for small lawns | 33 cm | 20 V |
| Mountfield Electress 34 Li | Best lightweight | 34 cm | 24 V |
| LawnMaster MX 24V | Best budget | 32 cm | 24 V |
| Webb WEV2012RB4 | Best for a fine finish | 30 cm cylinder | 20 V |
1. Hyundai HY40CLM38 - Best overall
The Hyundai HY40CLM38 runs on twin 20 V batteries wired in series for 40 V performance, which is where cordless mowers start feeling genuinely comparable to petrol. The 38 cm steel deck copes with medium UK lawns, and mulching, collecting and rear-discharge are all included.
Why it wins: genuine petrol-adjacent power, sensible price, and batteries share Hyundai wider 20 V range so you can build a tool platform around it.
Not for you if: you have a lawn over 500 m² - step up to a self-propelled petrol or robot mower.
2. Hyundai HY20CLM33 - Best for small lawns
The Hyundai HY20CLM33 is the sensible pick if your lawn is under about 200 m². A single 20 V battery, 33 cm cut and a light frame make it easy to store, easy to lift and easy to push. It is typically half the price of the HY40CLM38 and shares the same battery platform.
Why we like it: compact, quiet, and the collection box is bigger than most 20 V rivals in this class.
3. Mountfield Electress 34 Li - Best lightweight
The Mountfield Electress 34 Li weighs under 12 kg with the battery fitted, which makes it one of the easiest mowers on this list to lift onto a patio or up a step. Mountfield engineering pedigree shows in the deck geometry - cut quality is a step above most budget cordless mowers.
Best for: older gardeners, anyone with storage steps, or a second mower for a small formal lawn.
4. LawnMaster MX 24V - Best budget
The LawnMaster MX 24V is the cheapest mower we would genuinely recommend. 24 V gives you noticeably more torque than most 18 V budget picks, the 32 cm deck folds flat for storage, and the whole thing usually sits around the £150 mark including battery and charger.
Trade-offs: single-battery run-time is around 30 minutes, so this is a small-lawn tool. Buy a spare battery if you are on the borderline.
5. Webb WEV2012RB4 - Best for a fine finish
If you want cricket-square stripes without a petrol cylinder mower, the Webb WEV2012RB4 is one of the only cordless cylinder mowers on the UK market. Four blades, an adjustable cut down to 14 mm, and a rear roller for classic stripes.
Best for: ornamental lawns, formal front gardens, and anyone who has outgrown a rotary mower finish quality.
How to choose a cordless lawn mower
Match battery voltage to lawn size
Voltage is a rough proxy for power. As a UK guide:
- 18–24 V: lawns up to 200 m² - small front and back gardens.
- 36–40 V: lawns 200–500 m² - most suburban gardens.
- 56–80 V (or twin battery): 500 m²+ and longer, thicker grass.
Check battery capacity (Ah) not just voltage
A 40 V / 4 Ah battery will typically mow for around 40 minutes on flat, dry grass. If your lawn takes longer, buy a spare - swapping batteries is faster and cheaper than upgrading the whole mower.
Stick to one battery platform
The single biggest saving with cordless kit is sharing batteries across mower, trimmer, hedge cutter and blower. Hyundai 20 V range and DeWalt 18 V XR range both cover the full garden tool set.
Mulching, collecting or side discharge
Look for 3-in-1 decks that let you mulch in summer (feeds the lawn, no bag to empty) and collect in autumn (picks up leaves). Side discharge is only useful for very long grass.
Cordless vs petrol vs robot in 2026
Petrol still wins on very large or wet lawns, but the gap is closing quickly. Cordless is now the default recommendation for anything under 500 m². For hands-off mowing on any size lawn, see our best robot lawn mowers guide - a robot will typically pay for itself against a mid-range petrol mower over 5 years once you factor in petrol, oil and servicing.
The Garden- Review verdict
For most UK gardens, the Hyundai HY40CLM38 is the best balance of power, price and platform. Smaller lawns are better served by the HY20CLM33 or LawnMaster MX, and if a fine cut matters more than convenience, the Webb cordless cylinder is unique in this price bracket.
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