"Robot Mower Maintenance: Blades, Cleaning and Battery Care"

Updated 2026-09-30

A robot mower is far less work than mowing yourself, but it isn't zero work. A few minutes of upkeep every week or two keeps the cut clean and the mower out of trouble. Your mower's manual has the final word on intervals and parts; the tasks below apply to almost every model.

Always switch the mower off (and engage any lock or PIN) before you turn it over or touch the blades. Wear gloves when handling blades.

Blades: check often, replace cheaply

Most robot mowers don't use one big blade. They use small pivoting razor-style blades on a spinning disc, or a few swinging blades on a cutting head. These are cheap and quick to swap, usually held on by a single screw each.

• Check them every week or two during the mowing season. Look for chips, bends and dull edges.
• Replace them when they're worn, not on a fixed date. Many owners end up swapping every one to two months in peak season; lawns with sticks, acorns, sand or stones wear blades faster.
• Replace the whole set at once so the disc stays balanced. An unbalanced disc vibrates and wears the motor.
• Signs of dull blades: torn, brown-tipped grass a day after mowing, and longer run times to cover the same lawn.

Keep the underside clean

Grass clippings build up under the deck, around the blade disc and in the wheels, especially if the mower runs on damp grass.

• Brush off clippings from the deck, disc and wheels weekly. A stiff brush or a wooden stick works well.
• Don't hose it down unless the manual says the mower is rated for it. Many models are water-resistant enough for rain and a light rinse, but high-pressure water can force its way past seals.
• Clean the wheels and treads so the mower keeps its grip on slopes.

Look after the sensors

Wire-free mowers find their way with RTK antennas, cameras, LiDAR or a mix (see RTK vs LiDAR vs vision).

• Wipe camera and LiDAR windows with a soft damp cloth when they get dusty or streaked. Dirty lenses are a common cause of poor obstacle detection.
• Keep the RTK antenna's view of the sky clear if your model uses one. New tree growth over a season can weaken the signal.
• Clean the charging contacts on the mower and the dock now and then, so it charges reliably.

Install software updates

Brands regularly improve mapping, obstacle avoidance and edge cutting through app updates. Let the mower update when it's docked, and read the release notes for changes to features you use.

Battery care

Robot mowers use lithium-ion packs, which last longest when they aren't left flat or baking in heat.

• Let the mower dock and charge normally during the season. It manages its own charging.
• Before winter storage, charge the battery to the level the manual recommends (often partly or fully charged), and store the mower somewhere dry and above freezing. Our winterizing guide covers the full routine.
• Expect gradual capacity loss after a few seasons: shorter run times between charges are normal. Replacement packs are available for most major brands.

A simple routine

Choosing a mower? Compare every model in the comparison chart, or use the yard matcher to find ones that fit your lawn.