What to look for when buying a battery-powered lawn mower?
Match the mower to your lawn size first. Check battery voltage and amp-hour capacity, cutting width, adjustable cutting height, grass box volume, and whether the battery works with other tools you own. Weight and foldable handles matter for storage and carrying.
A cordless mower is only as good as its fit with your garden. Before comparing models, measure the lawn and note how often you mow. Bosch's guidance is straightforward on this point: small gardens mowed frequently need less power, while larger lawns and longer intervals between cuts demand more power and longer battery runtime. Buying a machine that is over- or under-specified for the job is a common mistake, and it costs you either money or a half-finished lawn.
[1]Battery voltage and capacity
For cordless mowers, two numbers matter: the voltage in volts (V) and the battery capacity in amp-hours (Ah). Voltage relates to the power class of the system; Bosch, for example, offers both 18V and 36V cordless mowers. Capacity governs how long you can mow before recharging. Bosch states its cordless mowers are suitable for lawns up to 600 m² with a 4Ah battery, and recommends at least 4.0 Ah for optimal results. If your lawn is bigger, the manufacturer suggests higher-capacity batteries such as 5Ah or 6Ah plus a fast charger, rather than a larger machine alone.
[1]Also check what the battery fits. Some brands run shared battery platforms across tools — Bosch's POWER FOR ALL system, for instance, lets one battery power multiple compatible garden tools. If you already own tools in a shared platform, a mower that takes the same battery avoids paying for a second battery and charger you do not need. That is a genuine cost saving, not a marketing detail.
[1]Cutting width and height
Cutting width determines how quickly the job is done. Bosch's guidance is that 32 to 40 cm suits small and medium lawns, and gardens with tight corners and narrow passages, while widths above 40 cm are recommended for lawns of 500 m² or more. Cutting height should be adjustable, since different grass types and seasons call for different lengths. Bosch's rule of thumb is to remove no more than one-third of the grass height in a single mow.
[1]Collection, mulching and handling
A larger grass box means fewer trips to the compost bin, and its capacity generally scales with the mower's size. A fill-level indicator is a small feature that saves considerable irritation. Some models include a mulching function, which chops clippings finely and returns them to the lawn as fertiliser; Bosch notes mulching works best with frequent mowing, one or two times weekly, removing only 10–20 mm at a time. For handling, look at the mower's weight if you will carry it, and foldable handles if shed space is tight.
[1]A worked comparison
Consider two lawns. A 150 m² town garden with flower beds and narrow gaps between shrubs calls for a compact, light machine with a cutting width around 32 to 34 cm; a shorter runtime covers it in one session, and manoeuvrability matters more than raw power. A 600 m² open lawn is different: a wider cut of 40 cm or more, a higher-capacity battery, and a fast charger so downtime between sessions is brief. The same logic applies to overgrown grass — start with the cutting height set high and lower it over successive mows rather than scalping it in one pass. Wet grass can technically be cut, but Bosch advises mowing dry to prevent clumping and avoid clogging the grass bag.
[1]Checking the price and the details
Once you have a shortlist, verify the exact model, its included accessories and whether the battery and charger come in the box — some listings are body-only. Compare the same product and specification across retailers, check dated price history rather than assuming a displayed price is current, and confirm the final delivered total with the retailer before ordering. A model number difference of a single character can mean a different battery or grass box, so match the specification line by line.
[2]Your next step: measure the lawn, decide your cutting width and battery capacity from that figure, then compare at least two retailers on the identical model, battery and charger included, before you buy.
[2][1]Sources and dates
- https://www.bosch-diy.com/gb/en/garden-tools/lawn-mowers · accessed 2026-10-18
- https://gardenscompared.com/ · accessed 2026-10-18