How to Keep Your Robot Lawn Mower in Perfect Condition

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What makes the difference

Most problems don't come from the product — they come from how it's used. Here's what actually makes a difference, ordered by impact, with concrete steps and the mistakes that keep repeating themselves. No generic advice: things you can apply today and notice tomorrow.

Step by step

1. Clean the housing and the cutting disc every week. With the robot switched off and turned upside down, use a stiff-bristle brush and a plastic scraper for grass compacted under the disc. Never use a pressure hose on motors and contacts. Grass buildup under the chassis is the number one cause of poor cutting quality.
2. Replace the blades every 6-10 weeks. Wear gloves, flip the robot upside down, and replace the blades and their screws all at once so the disc stays balanced. With a worn blade, the grass frays at the tip and turns yellow; with a fresh blade, the cut is clean and the lawn looks green again within two days.
3. Check the charging contacts and station. Clean the contacts on the robot and the base with a dry cloth, or an eraser if there's rust. Check that the base is still level and that the approach path hasn't filled up with leaves. Most "won't charge" issues come down to dirt on the contacts.
4. Check the perimeter wire after every gardening session. After scarifying, planting or digging, check that the robot still recognizes the perimeter. If there's a break, locate it section by section by disconnecting segments, and repair it with a waterproof gel connector — never electrical tape.
5. Adjust the cutting height from the station. Raise the cutting height in summer to shade the soil, and lower it in spring. Never drop it by more than a third in one go. A single seasonal adjustment prevents the August yellowing and the bare patches at the end of the season.
6. Prepare for winter storage with the battery at half charge. Full cleaning, new blades, battery at 50-60%, robot stored indoors somewhere dry and frost-free, and the transformer unplugged. Top up the charge halfway through winter. Check the firmware and perimeter again before the first cut of spring.

The rain sensor isn't always worth turning on

Cutting wet grass muddies the housing, mats the clippings and leaves wheel marks. But if the robot takes shelter every time it rains in high-rainfall areas, it falls behind schedule and patches of grass grow too tall to trim in a single pass. In rainy climates, the usual strategy is disable the sensor and clean more often.

The PIN code and GPS lock are real anti-theft protection

Robots sit out in plain view in the garden and are an easy target. The good ones require PIN to operate, they lock themselves if they leave their geofenced area, and some send a phone alert if they're picked up. Without that, a robot in an unfenced garden is a risky buy, and it's worth keeping the serial number somewhere safe so you can report it if stolen.

The narrow passage is where most installations fail

Robots need a minimum width to maneuver: below about 60-80 cm between obstacles, they can't get through or get stuck. A garden split into two zones connected by a 50 cm passage forces you to carry the robot by hand or install a second base. It's the detail that causes the most disappointment, and it takes five minutes to check before buying.

Lithium batteries last longer when stored partially charged

At the end of the season, the battery shouldn't be stored at 100% or empty: the right level is around 50-60%, in a dry, frost-free spot, and topping up the charge halfway through winter if the robot will sit idle for months. Storing a lithium battery fully discharged all winter is the most effective way to kill it.

• Build quality and finish
• Recent verified reviews (including 3-4 star ratings)
• Warranty and return policy
• Current price versus its historical average
• Seller reputation
• Making sure the key features match your needs (Everyday Use)

The perimeter wire can be buried or staked down, and it makes a difference

Stapled to the surface, it's quick to install and the grass covers it within three weeks, but it stays exposed to scarifiers, hoes, and dogs. Buried 3-5 cm deep with a trimmer or a fine hoe makes it invulnerable. And at corners you need to respect the minimum radius specified by the manufacturer, because a sharp angle causes erratic readings.

Criteria	STIGA A 500Our pick	Gardena SILENO City 500
Ideal for	Balanced, all-round use	Everyday Life
Strength	Value for money	Specific features
Ratings	Very positive and numerous	Positive
Estimated price	from ~€320	from ~€200
Recommendation	Our pick	Best alternative
View on Amazon	See price →	See price →

The robot lawn mower isn't cutting — it's wearing down the grass every day

A traditional mower cuts several centimeters at once every two weeks. The robot trims about millimeters each day, so the clippings are fine enough to break down right on the lawn and act as fertilizer: it's mulching continuous. That's why there's no bag to empty, and why a robot-mowed lawn tends to be denser and greener than a hand-mowed one.

To wrap up

Apply the points above first, since they make the biggest difference, and leave the rest for once you've got some experience under your belt. If after that you're still not getting what you're after, then it does make sense to switch equipment: the STIGA A 500 is the most balanced option for making the jump, with the Gardena SILENO City 500 as an alternative.

Frequently Asked Questions

Can it mow when it's raining?

It can, but it muddies the housing and leaves wheel marks. In very rainy climates it's usually best to disable the rain sensor and clean more often, because if the robot takes shelter too much, tall grass builds up that it can no longer trim in a single pass.

How often should the blades be replaced?

Pivoting blades, every 6-10 weeks of use or sooner if you notice the grass looking frayed instead of cut. They're very cheap, and replacing them is the maintenance task that makes the biggest visible difference to your lawn. Replace them all at once so the disc stays balanced.

What height should I mow at?

Never remove more than a third of the blade height at once. In summer, raise the cutting height to shade the soil and retain moisture; in spring you can lower it. A robot fixed at 2 cm in the middle of August will scorch the lawn.

Could it be stolen from my garden?

It's a real risk. Look for a mandatory PIN, geofenced locking and a phone alert when it's picked up. Keep the serial number somewhere safe. In an open, visible garden, those features stop being a nice-to-have.

How many square meters does a robot actually cover?

Considerably less than what the box says if your garden is irregular. The stated figure assumes long working days and a clear surface. With trees, flower beds and narrow passages, allow a 30% margin over your measured area.

Should I Go With the STIGA A 500 or the Gardena SILENO City 500?

The STIGA A 500 is the most balanced option and the one we recommend by default. The Gardena SILENO City 500 makes sense if your priority is Everyday Use. As a budget reference, the useful range starts around €200 and the best balance tends to sit around €320.

By the Robot Jardín Team · reviewed by

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