How to use an electric lawn mower
Updated: October 2026
The first cut is the one that goes wrong: a lead across the stripe you are about to mow, wet grass, or a chute you clear while the machine is still live. This is how to use an electric lawn mower once, with the stop points written in. It assumes you already chose the machine on the [electric lawnmower 40 cm comparison](/hub/lawn-and-garden-equipment/electric-lawnmower-40cm). The steps follow the Royal Horticultural Society and Electrical Safety First. A purchase through our links may earn a commission at no extra cost to you.
The first cut is the one that goes wrong: a lead across the stripe you are about to mow, wet grass, or a chute you clear while the machine is still live.
The first cut is the one that goes wrong: a lead across the stripe you are about to mow, wet grass, or a chute you clear while the machine is still live. This is how to use an electric lawn mower once, with the stop points written in. It assumes you already chose the machine on the electric lawnmower 40 cm comparison. The steps follow the Royal Horticultural Society and Electrical Safety First. A purchase through our links may earn a commission at no extra cost to you.
Our top picks
| Badge | Product | Power | Lead | Cutting height | Note | Price | Offer |
|---|---|---|---|---|---|---|---|
| Best overall |  Flymo Flymo Speedi-Mo 360C | Corded, 1500 W | n/a | 20–60 mm, 5 steps | 9.2 | about £110 | View offer |
| Alternative |  Worx Worx WG737E | Cordless, 40 V | No mower lead | 20–70 mm, 6 steps | 9.0 | about £229 | View offer |
 Flymo Flymo 38 cm corded | Corded, 1600 W | 10 m | 20–60 mm, 5 steps | 8.8 | about £135 | View offer |
On this page
Before the first pass
Walk the lawn before you plug anything in. Stones and a forgotten peg sit in the blade line, and the RHS notes eye protection when stones may be hidden. Wear robust shoes. Know where the dead-man’s handle is before the grass is long, so the mower stops when you let go.
On a corded mower, check for a BS 1363 three-pin fused plug. Electrical Safety First wants an RCD on the outdoor supply so the mower stops if the cord is cut. If the socket may have no RCD, stop and call an electrician. Do not mow wet grass. The RHS agrees: no rain. Fit the box or the mulch plug while the mower is unplugged, or while the cordless pack is off.
Keep the lead behind you
The RHS and Electrical Safety First both want the cable behind you. Mow away from the lead, not across it. Start beside the socket, keep the spare lead on grass you have already cut, and turn so the loop stays visible. If you cannot see the lead, stop and place it again.
Four listings state a 10 m lead: the Einhell GC-EM 1600/37, the Hyundai HYM3800E, the LawnMaster MEB1840M-01, and the Flymo 38 cm. Reviews call that short. A path from the house wall to the first grass can use half of 10 m before you cut anything. If you use one outdoor extension, unwind it fully and use a lead with a thermal cut-out. Do not plug a second extension into the first. A cut cable is a stop: unplug, do not tape it, and use the seller. Whether to buy a lead or a battery sits on the corded versus cordless page.
Set the height for the grass you have
Long grass wants a higher setting first. That pattern is in reviews on several corded models and on the Ryobi, not a laboratory chart. The motor cuts out when the setting is too low for the length in front of the deck. On the Einhell 43 cm kit, a week of growth on the lowest setting is too much. The Hyundai struggles or overloads in longer grass in the same way.
Use the highest or the next step, cut once, then drop a step if the lawn can take it. Where heights are printed, they run from about 20 mm up to 60–75 mm. The Hyundai states five steps and no millimetre range. The AdvancedRotak does not state a range. Use the lever you can see.
If it cuts out or smells hot
A cut-out is often the grass, not a dead motor. Raise the height and let the blade stop. Unplug a corded mower before you lift the deck or put a hand near the chute. Electrical Safety First and the RHS both say to unplug before the blade. Switch a cordless mower off and take the pack off if that is how it isolates. Do not clear a chute while the machine is plugged in.
If it smells hot, or it cuts out on short grass at a sensible height, stop for the day. Use the seller while any warranty still matters. Do not open the housing. A cordless mower deletes the lead and keeps the blade. You still do not clear the chute with the pack fitted and the switch live. Several Einhell 43 cm reviews report a two-pin plug. Do not add a travel adaptor. Changing the machine belongs on the buying guide.
Common questions
Can I mow wet grass?
Electrical Safety First says not to mow in the wet, and the RHS says not to mow in the rain. Damp grass is also a repeated Ryobi complaint. One AdvancedRotak reviewer describes a wet spring cut that collected. That is one report, not permission for the rest of the set. If the lawn is soaked, wait until it is surface-dry.
Where should the cable sit?
Behind you, on grass you have already cut, never in the next stripe. Start near the socket and keep the loop visible. If you lose sight of the lead, stop. A stated 10 m lead on the Einhell 37 cm, Hyundai, LawnMaster, or Flymo 38 cm disappears quickly when the socket is on the house wall and the lawn starts after a path.
Do I need an RCD?
Yes for a corded mower on an outdoor supply. Electrical Safety First wants an RCD so the machine stops if the cord is cut. Test it with the device’s own button before you mow. If you cannot tell whether the socket is protected, ask an electrician. A household adaptor is not a substitute.
Can I join two extension leads?
No. Electrical Safety First says not to daisy-chain leads. One outdoor extension, fully unwound, with a thermal cut-out, is the version they describe. Joining a second lead because the mower’s 10 m feels short is the mistake this guide is trying to prevent. If the lawn is out of reach, that is a buying problem.
When do I unplug?
Before the blade, before a blockage, and before you fit a badly seated box. Take the battery off a cordless mower when that is how it is isolated. A stall on long grass is a reason to unplug and raise the cut, not a reason to lift the chute with the lead still in the socket.
Related pages
Sources
Sources from the research digest. Listings were captured on amazon.co.uk on 19 October 2026.
- Electrical Safety First: lawnmowers (retrieved 19 October 2026)
- Electrical Safety First: garden (retrieved 19 October 2026)
- RHS: electricity in the garden (retrieved 19 October 2026)
- RHS: mowing (retrieved 19 October 2026)
- GOV.UK: outdoor noise (retrieved 19 October 2026)
- legislation.gov.uk: outdoor noise, Schedule 3 (retrieved 19 October 2026)
- The English Garden: corded and electric lawn mowers (retrieved 19 October 2026)
- Gardeners' World: electric lawn mowers (retrieved 19 October 2026)