Bosch UniversalRotak 2x18V-37-550 Cordless Lawnmower

Bosch UniversalRotak 2x18V-37-550 Cordless Lawnmower

By Bosch · Model: UniversalRotak 2x18V-37-550 · Landscaping & Outdoors

Cordless lawnmower with 37cm cutting width, dual 18V battery system, and 40-litre grass box for medium-sized lawns up to 500m².

  • 37cm cutting width suitable for medium lawns up to 500m²
  • Dual 18V battery system (2x 4.0Ah batteries included)
  • ProSilence motor — significantly quieter than petrol mowers
  • 7 cutting height settings from 20mm to 70mm
  • 40-litre grass catcher with full indicator
  • Ergonomic folding handles for compact storage
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Overview

The Bosch UniversalRotak cordless mower brings the convenience of battery power to medium-sized lawns. The dual 18V system provides the runtime to cover up to 500m² on a single charge, while the ProSilence motor makes it quiet enough to use early in the morning or in the evening without disturbing neighbours.

In-Depth Look

Cordless mowers have reached the point where they genuinely compete with petrol for most domestic lawns. The Bosch UniversalRotak 2x18V-37-550 is the model that covers the majority of UK garden sizes with enough battery life and cutting performance to make a petrol mower unnecessary.

Dual Battery System

The dual 18V configuration uses two 4.0Ah batteries simultaneously, delivering 36V-equivalent power and runtime. Both batteries and the charger are included in the box, making this a complete out-of-the-box solution. On a fully charged pair, the mower covers up to 500m² before the batteries need recharging. The 4.0Ah batteries are compatible with other tools in the Bosch 18V UniversalSeries range, including the hedge trimmer and blower.

ProSilence Motor

At the rated noise level, the ProSilence motor produces less than half the acoustic pressure of a comparable petrol mower. This is a practical advantage in residential areas where early-morning or late-evening mowing can cause friction with neighbours. Many UK local authorities have restrictions on noise above certain decibel thresholds during specific hours; the ProSilence motor typically keeps the mower within acceptable limits where a petrol equivalent would not.

Cutting Height and Grass Box

Seven cutting height settings from 20mm to 70mm cover the full range from a closely cut ornamental lawn to a relaxed meadow-style height. The 40-litre grass box is adequate for a 500m² lawn before emptying. A full-indicator window shows when the box is approaching capacity. For very long or wet grass, the mower struggles more than a petrol equivalent — the standard recommendation of not cutting more than one-third of the grass blade height applies here as for any rotary mower.

Storage

The folding handles reduce the footprint for garage or shed storage. The mower should be stored with the batteries removed when not in use for extended periods, and should not be stored with wet grass inside the housing.

Verdict

The Bosch UniversalRotak cordless mower is the sensible, low-maintenance choice for UK homeowners with gardens up to 500m². No petrol, no cables, no excessive noise — and batteries and charger included from day one.

Specifications
Cutting Width37cm
Battery2x 18V 4.0Ah (included)
Cutting Heights20-70mm (7 settings)
Grass Box40 litres
Lawn SizeUp to 500m²
Weight14.9kg (with batteries)

Who It's For

  • Homeowners with medium-sized lawns wanting cordless convenience
  • Anyone wanting a quieter alternative to petrol mowers
  • Gardeners wanting freedom from cable management and extension leads

Pros & Cons

Pros

  • Cordless freedom — no cables, no petrol, no emissions
  • ProSilence motor is noticeably quieter than petrol alternatives
  • Batteries and charger included — ready to use out of the box
  • Lightweight and easy to manoeuvre compared to petrol mowers

Cons

  • Battery runtime is finite — very large lawns may need a recharge
  • 37cm cutting width is slower than wider petrol mowers
  • Not suitable for very long or wet grass
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