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Al-Ko 42.9 Li SP cordless lawn mower - BBC Gardeners' World

Al-Ko 42.9 Li SP cordless mower review

A light, compact, easy to use cordless mower.

Our rating 
4.8 out of 5 star rating 4.8

In a nutshell

With a run time of 20 minutes and seven heights of cut this mower is light and easy to handle. Awarded a BBC Gardeners’ World Magazine Best Buy it comes with a five year warranty on the mower with two years on the battery.
Ease of Handling
5.0 out of 5 rating 5.0
Cutting Performance
4.0 out of 5 rating 4.0
Setting up / Storage
5.0 out of 5 rating 5.0
Value for money
5.0 out of 5 rating 5.0
Pros: Brushless motor

Steel deck

Light and manoeuvrable

Front carry handle

Large grass collector

Solid simple design

One of the quieter models tested

Cons: Not especially fast
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What are the main features of the Al-Ko 42.9 Li SP mower?

This compact, cordless mower is powered by a 40V 4Ah lithium ion battery, which takes 90 minutes to charge. A run time of around 20 minutes makes it ideal for cutting smaller lawns up to 400m2 and it has a cutting width of 42cm. With a simple cut and collect function there’s a large mesh bag with a capacity of 60L to collect the grass and this has a level indicator so you know when it needs emptying. There are seven different heights of cut, between 30 and 75mm and these are easily adjusted with a single lever. The mower has a brushless motor and a sturdy steel deck and the battery and charger are included in the price
This mower is part of the Al-Ko Energy Flex system and the battery and charger are interchangeable with other cordless tools in the system, saving you money if you buy more tools in the future.

What is the Al-Ko 42.9 Li SP cordless mower like to use?

Solidly made with a simple design this mower is easy to use. An LED display on the battery lets you know when it’s ready to recharge and it has an ergonomic handle with a rubber grip that’s comfortable to hold. It feels light and easy to turn and manoeuvre around the lawn. It’s self-propelled with a decent single speed but it’s not especially fast. It was one of the quieter models in our test.

Is the Al-Ko 42.9 Li SP cordless mower easy to store?

Light and compact this mower is easy to move around the garden and back into the shed. A carry handle on the front of the deck makes it easy to lift up steps or onto a shelf and the handle folds down so it takes up less room in storage. The mesh collection bag can be detached and laid down flat on top of the deck.

Is the Al-Ko 42.9 Li SP cordless mower good value for money?

Well priced for a self-propelled, cordless mower this easy to use machine comes with a five year warranty on the mower and two years on the battery. We think it’s excellent value for money.

Cordless Mowers – Buyer’s Guide video


For more reviews, read our round-up of the best cordless lawn mowers.

Product Specifications


Brand AL-KO
Name Al-Ko 42.9 Li SP cordless mower
Model 42.9 Li SP
Price £569.00
Lawn mower type Electric - cordless
Part of multi tool system Battery compatible with all Al-Ko EnergyFlex tools


Powered by Lithium-ion battery
Battery life 20min(s)
Cutting height 30-75mm
Number of cutting height settings 7
Cutting width 42cm
Collection capacity 60l
Lawn size suitable for 400m²
Noise 91dB
Weight 23kg
Warranty 2YEAR