The Karcher LMO 4-18 Dual Battery Set battery lawnmower boasts a brushless motor and dual battery power of 36 V (18 V + 18 V) . This ensures efficiency even on more difficult terrain, while the brushless motor design also allows for a longer service life. Other important features of the battery lawnmower:

• iPower technology for automatic adaptation to grass;
• cutting width 37 cm ;
• 40-liter grass collection box;
• cutting height 25–65 mm etc.

Karcher LMO 4-18 Dual Battery Set Battery Lawn Mower
Two 18 V batteries for a powerful 36 V motor combined with a 37 cm cutting width – ideal for lawns up to 450 m2. Batteries and fast charger included.

Powerful and very agile: with two 18-volt batteries and a brushless 36-volt motor, the LMO 4-18 Dual Battery Set is the ideal solution for lawns up to 450 square meters. The low weight makes the lawnmower particularly agile and manoeuvrable. It can also be easily manoeuvred on uneven terrain and around obstacles. The working width is 37 centimeters and the cutting height can be centrally adjusted in five stages between 25 and 65 millimeters. Thanks to the intelligent iPower motor control, the speed is automatically adjusted to the condition of the grass during mowing. The lawn combs automatically catch the grass, even if it grows close to the edges. With the 2-in-1 mowing system, the clippings are distributed evenly over the lawn via the mulching plug to act as fertilizer, or are collected in the large 40-liter grass collector - for continuous mowing for longer. The height of the handlebar can be adjusted for a comfortable working position. When the frame is folded, it takes up less space when stored. It has a large, sturdy handle for carrying up and down stairs. Batteries and a fast charger included.

Features and benefits

18 V + 18 V = 36 V of power:
• Powerful 36 V motor powered by two 18 V li-ion batteries.

Powerful brushless motor:
• High performance and longer product life

iPower:
• Extra performance and optimized battery runtime. Thanks to intelligent motor control, the speed is automatically adjusted to the condition of the grass while mowing.

2-in-1 mowing system:
• The cut grass is efficiently collected in the grass catcher during mowing.
• Mulching function: using the mulching kit, the cut grass is spread over the lawn as a natural fertilizer.
• Sharp steel blade for precise mowing results without tearing the grass blades.

Efficient filling of the grass catcher:
• Thanks to the optimized airflow, the grass catcher is filled to 95%. This means fewer blockages during work.
• The flap on the grass catcher closes when the catcher is completely full and needs to be emptied.

Easy cutting height adjustment:
• With a single movement, you can easily adjust the cutting height to one of five levels, ranging from 25 mm to 65 mm.

Mowing all the way to the edge of the lawn:
• The grass rake automatically captures even the grass right at the edge of the lawn.

Space-saving design:
• The textile collection bag can be folded to a very small size and stored on the lawnmower in a space-saving manner.
• Foldable guide handle allows for storage in a small space.

Built-in carrying handle:
• Built-in carrying handle allows for easy transport.

Ergonomic handling concept:
• The guide handle can be adjusted to your body height – to ensure an upright posture while working.
• Foam handle provides a secure hold and a comfortable feel.
• Full-length control stick on the guide handle allows for easy operation.

Technical data:
• Motor voltage (V): 36
• Device: battery-powered
• Battery platform: Battery platform 18 V
• Cutting width (cm): 37
• Cutting height (mm): 25 - 65
• Cutting height adjustment: 5-fold
• Grass catcher capacity (l): 40
• Drive: Brushless motor
• Number of revolutions (rpm): 3500
• Battery type: Lithium-ion replacement battery
• Voltage (V): 18
• Capacity (Ah): 5
• Number of batteries required (Piece(s)): 2
• Capacity with full battery * (m2): max. 225 (2.5 Ah) / max. 450 (5.0 Ah)
• Operating time with full battery (min): max. 20 (2.5 Ah) / max. 40 (5.0 Ah)
• Battery charging time with fast charger 80% / 100% (min): 94 / 143
• Charging current (A): 2.5
• Charger mains connection (V/Hz): 100 - 240 / 50 - 60
• Color: Yellow
• Weight without accessories (Kg): 14,171
• Dimensions (L x W x H) (mm): 1222 x 437 x 1002

Scope of delivery
• Option: Batteries and charger included
• Battery: 18 V / 5.0 Ah Battery Power battery (2 pcs.)
• Battery charger: 18 V Battery Power fast charger (2 pcs.)
• Mulching kit
• Grass collection basket

Equipment:
• Blade
• Height-adjustable guide handle
• Built-in carrying handle
• Charge level indicator

Same summary

The Karcher LMO 4-18 Dual Battery Set battery lawnmower is best suited for users with small to medium-sized gardens or terraces, where ease of use and maneuverability are important. With two batteries included and a cutting width that allows for quick enough processing of most domestic lawns, it will also suit those who want to reduce interruptions in work due to battery discharge. Due to its compact dimensions and moderate basket capacity, it is less suitable for very large or complexly shaped lawns, where even greater capacity would be required. A particular advantage is its usability in areas with multiple edges or narrow passages, where classic larger lawnmowers are often not practical.

Recommendation source: Enaa guides and team experience.

User view

This type of cordless lawnmower is a common choice for households or individuals who want to quickly and easily maintain a tidy lawn, whether they are mowing around the house or on the weekend. Many users appreciate that cordless lawnmowers are not limited by electrical cables, making it easier to mow in all corners of the garden, even between flower beds and next to trees. The included extra battery means fewer interruptions, which is welcome when mowing larger areas regularly.

Users often choose Kärcher products because of their reputation in the world of garden tools and reliable support across the entire ecosystem of home and garden devices.

Why buy at Enaa

At Enaa you will find expert descriptions that make it easy to compare different models of cordless lawn mowers, as well as useful filters to make your choice easier based on the actual needs of your home or garden. We bring together the offer of different brands in one place and provide clear information about the included batteries and basic technical differences.

Answers to frequently asked questions

What size garden is the lawnmower best suited for?

The mower is best suited for small to medium-sized gardens or lawns where agility and ease of use are required. It is most effective on areas up to approximately 400 m², and with two batteries you can cover slightly larger areas without interruption.

Are the batteries included really useful for longer mowing?

Yes, you can use both batteries in sequence, significantly extending the mowing time without the need for recharging. This solution is practical for users who need to mow larger green areas several times in a row.

What are the advantages of a narrower cutting width?

The narrower cutting width allows for efficient maneuvering in narrow and winding parts of the garden, such as around trees, flower beds and along curbs, where larger mowers are less convenient.

Is the lawnmower easy to store in small spaces?

Since the lawnmower usually has a foldable handle and a compact construction, storage is quite simple even in smaller garden sheds or garages and does not take up much space.

What is good to know about the included batteries and the Kärcher system?

The batteries are compatible with other devices from the Kärcher program with the same battery system, allowing users to easily replace and flexibly use the brand's entire family of tools.

Description updated: April 2026