How to Choose a Cordless Vacuum in 2026

Cordless stick vacuums are sold on a single headline number, and it is almost never the number that decides how the machine behaves in a real house. Five published specs do most of that work: suction in air watts, runtime, dust bin capacity, the filtration rating, and whether the battery detaches. This guide explains what each one physically changes, then lays three models side by side against those axes.

Air watts describe suction at the floor head, not motor size

Air watts combine airflow and vacuum pressure, which is why the figure is more useful than the raw wattage or the kilopascal number some brands print instead. Roughly, it is the spec that predicts whether the machine lifts debris out of carpet pile rather than skating over it.

The returns are not linear, though. On hard floors and low-pile rugs, anything from about 100 AW upward picks up the same crumbs, and the difference between 120 AW and 270 AW is nearly invisible. On medium and deep-pile carpet the gap opens sharply, because the suction has to overcome the fibres holding the dirt. Read air watts as a carpet spec, and discount it heavily if your floors are mostly hard.

Published air-watt figures also describe maximum power mode — the mode that drains the battery fastest.

Runtime is a maximum-in-eco-mode figure

Every runtime number in this category is measured in the lowest power setting, usually with a non-motorised tool fitted. That is not how most people vacuum. In max mode, expect a fraction of the published figure — which is why a 60-minute rating and a 105-minute rating are further apart in practice than they look on paper.

The number that actually matters is whether one charge covers your floor plan in the mode you use. A small apartment rarely tests any of these. A two-storey house on carpet frequently outruns the shorter-rated models, and that is where the battery row below does more work than the runtime row.

Dust bin capacity sets how often you stop, not how well it cleans

Bin capacity in this class runs in a narrow band — roughly 0.5 to 0.8 litres — and none of it affects suction. What it changes is interruptions. A 0.6-litre bin handles a room or two before it needs emptying; a 0.8-litre bin stretches that, which matters mostly during a whole-home clean or after a shedding pet.

If you vacuum in short, frequent passes, capacity is close to irrelevant. If you do one long weekly clean, it is the spec that decides how many times you walk to the bin.

Filtration is where the published figure is worth reading closely

Sealed multi-stage filtration is what keeps fine dust from passing back out through the exhaust, and this is the axis where the published percentages are meaningfully different: 99.9% and 99.999% are two orders of magnitude apart in what escapes, even though they look nearly the same in a spec list.

That gap matters if anyone in the house reacts to dust or dander. If nobody does, a five-layer system at 99.9% is not a compromise you would notice. Watch for models publishing no filtration rating — one here does not, which leaves the axis unverifiable rather than proving anything.

Matching the specs to your floors

The useful question is which constraint binds hardest in your home.

• Mostly hard floors — suction is the spec to stop optimising; weight and bin capacity change your experience far more.
• Deep-pile carpet — air watts, and treat everything else as secondary.
• A large or multi-storey floor plan — a detachable battery, because a second pack removes the runtime ceiling entirely.
• Someone in the house reacts to dust — the published filtration percentage, and treat an unpublished one as unknown.
• One long clean per week rather than short passes — bin capacity, which is the spec that decides how often you stop.

The spec table carries the published figures for each of these axes.

Frequently asked questions

Are cordless vacuums powerful enough to replace a corded upright?

For hard floors and low-to-medium pile carpet, the published air-watt figures on current stick vacuums sit in the range that corded uprights occupied a few years ago. The gap that remains is on thick, deep-pile carpet, where higher-AW models close most of it and entry-level ones do not. The other difference is runtime: a corded machine does not have one.

How long do cordless vacuum batteries actually last on a charge?

Published runtimes of 60 to 105 minutes describe the lowest power setting, typically with a non-motorised tool attached. Running a motorised brush head on max power cuts that substantially. Models with a detachable battery sidestep the issue, since a spare pack can be swapped in rather than waiting out a recharge that manufacturers commonly state at three hours or more.

Is an auto-empty dock worth looking for?

None of the three options here include one, which is still normal outside the very top of the market, and a 0.6 to 0.8 litre bin empties by hand in a few seconds. It is a convenience feature rather than a cleaning-performance one — the specs that change how the machine cleans are suction, filtration and the brush head, none of which the dock touches.