What a cordless vacuum’s runtime figure actually means

One machine, one battery, 80 minutes or 13 — both figures published by the maker.

Every cordless vacuum page leads with a minutes figure, and almost none of them tell you which minute you are buying. What follows is the same machine quoted two ways by the company that built it, what four makers each do differently, and the arithmetic that explains why the spread is so wide.

How this was researched

We built this from the published runtime specifications on four manufacturers' own support pages — three of them by power setting, one as a headline figure only — and worked the energy arithmetic ourselves from the battery ratings one of them publishes.

We have not timed a cordless vacuum for this page and we do not have a test bench. Every runtime figure here is the manufacturer's own published number. The energy calculation is ours and is labelled as ours, with its assumptions stated. Where a maker does not publish the condition behind a figure, the page says that rather than guessing it.

One machine, two numbers

The clearest demonstration is not a comparison between brands. It is a single manufacturer's support page for a single model, which lists runtime by power setting and by what is attached to the machine.

Handheld only

Eco 72–80 min

Normal 32–35 min

Turbo 26–30 min

Handheld, tube and powered floor head

Eco 29–50 min

Normal 19–28 min

Turbo 13–20 min

020406080 min

Source: the manufacturer’s own support page for this model. The two ends of the chart are the two figures a retailer is most likely to quote, and the gap between them is about six to one. The source figures above were read on 23 September 2026.

Both rows are the same vacuum, the same battery and the same full charge. The top-left cell and the bottom-right cell are the two ends of the range, and the gap between them is roughly six to one. A listing that says “up to 80 minutes” is quoting the top-left cell. A listing that says “up to 20 minutes” is quoting the bottom-right one. Neither is lying.

The powered floor head is doing most of the damage, and that is worth pausing on, because it is not a power setting you can choose. A motorised brush roll draws current of its own, and it is the attachment that makes the machine a floor vacuum rather than a dust buster. The configuration that produces the headline number is the one where you are not vacuuming a floor.

Four makers, four ways of stating it

The reason two brands' runtime figures cannot be put side by side is that the makers are not measuring the same thing, and only one of the four we read says so on the page.

One maker goes further and states outright that its runtimes are measured under controlled testing conditions and will vary depending on power mode, floor type and cleaning habits — and that most manufacturers quote a maximum figure measured on a lower power setting in controlled conditions. That is a manufacturer describing the industry's own reporting convention on its own website, which is more candour than the specification tables usually carry.

The comparison to make in your head is with categories that do have a single agreed measurement. Air purifiers have a named standard for clean air delivery rate; dehumidifiers have a mandated test condition, which is why the same machine was re-rated when that condition changed. The cordless vacuum figures we read were not accompanied by a named test standard on any of the four pages. That is not the same as saying no standard exists — it is saying you cannot verify what was measured from what the maker printed.

Why the spread is so wide: the battery is a fixed amount of energy

The reason a vacuum cannot simply “last longer” is that runtime and power are two views of the same quantity. A battery stores a fixed amount of energy, and a vacuum spends it. Spend it faster and you get more suction for less time. There is no third option.

One manufacturer makes this unusually easy to check, because it publishes both the battery rating and the runtime at each power level for the same machine. Its pack is rated 22.2 V and 2,000 mAh, and its published runtimes are up to 60 minutes on low, around 40 on medium, and 15 to 20 on high.

That third column is our arithmetic, not a published figure. The assumptions: 22.2 V multiplied by 2.0 Ah gives about 44 Wh of stored energy; dividing that by each published runtime gives the average power the machine must be drawing to last that long. The calculation treats the pack as delivering its full rated energy, which a real pack does not quite do, so the wattages are indicative rather than exact.

Two things fall out of it. The first is that the spread between the modes is real and large — roughly a factor of three between low and high — which is exactly the spread the published runtimes show. The second is that the machine's 250 W motor rating is nowhere near its average draw on any setting. Motor wattage ratings are peak figures, and comparing them to a runtime is comparing two different things.

The top figure may not be available on day one

There is a further condition buried in one manufacturer's support pages that most buyers never read. To achieve the maximum runtime, it states, the machine must first be calibrated — fully charged approximately five times, and between charges run until it has no battery remaining.

The same page explains why the display can mislead in the meantime. When the machine comes off the charger it enters an idle state, and on first power-up it can display an incorrect runtime; it takes up to about 30 seconds of running for it to assess the actual charge and current draw and show the right figure. There is a learning algorithm involved, and the maker recommends fully charging after every use to help it stay accurate.

The practical reading is that the headline figure is the ceiling after a settling-in period, not the figure the machine shows out of the box. If you are judging a new vacuum by its own display in the first week, you are judging the algorithm, not the battery.

What to check before you buy

• Find the runtime at maximum power with a powered floor head attached. That is the number that describes cleaning a carpet, and it is usually not the number on the box.
• Check whether the figure names a power setting at all. A number without a setting is not comparable to anything.
• Look for a runtime table rather than a runtime figure. One of the four makers we read publishes the whole curve. That is the format worth rewarding.
• Multiply the battery's volts by its amp-hours for a rough energy figure, then divide by the boost-mode runtime you were quoted. If the answer looks like an implausible power draw, one of the two numbers is not what you think it is.
• Ask whether the battery is swappable. A second pack is the only honest answer to a runtime problem, and it converts a curve into a total. On a machine with a sealed battery, the runtime figure is a hard ceiling for the life of the product.
• Expect the number to fall. One maker states plainly that its runtimes are measured with a 100% charge, a new battery and a new appliance, and that capacity decreases over time and use. The figure on the box is a year-one figure.
• Weigh the whole machine, not just the minutes. A vacuum with a longer runtime and a heavier body gets used less. Runtime is the spec people compare and rarely the one that decides whether the machine comes out of the cupboard.

The honest answer

A cordless vacuum does not have a runtime. It has a runtime at a given power setting, on a given floor, with a given attachment, with a battery of a given age — and the published figure is the most favourable point on that surface. On one manufacturer's own numbers, the same machine is 80 minutes in one configuration and 13 in another.

That does not make the numbers dishonest. It makes them incomplete, in a specific and predictable way: the missing variable is always the one that makes the figure look worse. So the useful habit is not to distrust the number, but to ask what it was measured with — and if the page will not say, to treat it as a ceiling rather than an expectation.

For the same problem in the machine's other headline figure, see whether robot vacuums work on carpet, where suction in pascals turns out to answer the question least well. For the part that decides whether the vacuum keeps working at year three, see robot vacuum battery replacement and how long robot vacuums actually last.

Questions this page answers

What does a cordless vacuum's runtime figure actually mean?

It is a curve, not a number. A cordless vacuum has a different runtime at every power setting, on every floor, with every attachment. The box quotes one point on that curve.

How wide is the spread between the best and worst runtime?

One manufacturer publishes 80 minutes for its machine as a handheld on eco, and 13 minutes for the same machine as a full stick on its highest setting — about a six-to-one gap.

Why can't you compare runtime figures across brands?

Because the makers do not publish the same condition. One states its figures are measured under controlled conditions that vary with the test.

Is the advertised maximum runtime available on day one?

Not necessarily. One maker states the machine must be calibrated — fully charged about five times and run flat between charges — before maximum runtime is reached.

Where this comes from

This page rests on four manufacturers' published runtime specifications, plus our own battery arithmetic. All were read on 1 October 2026.

• That one model's runtime varies by power setting and by attachment, with eco handheld runtimes of 72–80 minutes and turbo full-stick runtimes of 13–20 minutes; that runtimes depend on floor type; and that runtimes are measured with a 100% charge, a new battery and a new appliance, with capacity decreasing over time and use: the manufacturer's published runtime specification for that model. This is the manufacturer of the vacuum. It has a commercial interest in the machine appearing to run for a long time, and it is nonetheless the source publishing the widest spread on this page — which is the point we are using it for.
• That eco, auto and boost modes are quoted as up to 60, up to 40 and up to 5 or 6 minutes on some models and up to 10 minutes on others; that runtime varies with power mode, floor type and tool; that the machine must be calibrated with about five full charges and full discharges before maximum runtime is achieved; and that a first power-up after charging can display an incorrect runtime for up to 30 seconds: a second manufacturer's published support documentation across several models. Also a manufacturer source, with the same commercial interest. We have used its calibration requirement and its mode table, and we note that its boost figures differ between models rather than treating them as one number.
• That most manufacturers quote a maximum runtime measured on a lower power setting in controlled conditions, and that this maker's own runtimes are measured under controlled testing conditions and vary with power mode, floor type and cleaning habits: a third manufacturer's published guidance on how its runtime figures are tested. This is a manufacturer describing its own testing and, unusually, the industry convention. It has a commercial interest, and the statement is against that interest, which is why we have quoted it rather than a content site making the same point.
• That a cordless vacuum with a 22.2 V, 2,000 mAh pack and a 250 W motor is rated for up to 60 minutes on low, around 40 on medium and 15–20 on high: a fourth manufacturer's published product specification. Manufacturer source. We have used its battery rating and its mode runtimes, and we have not used its marketing claims about suction.
• The implied average power draw for each mode, the observation that the motor's 250 W rating is a peak figure rather than an average, and the conclusion that the published spread is explained by the battery holding a fixed amount of energy: our arithmetic, from the battery rating and runtimes published by the fourth manufacturer above. The calculation assumes the pack delivers its full rated energy, which it does not in practice, so the figures are given as approximate.

What we did not do and are not going to imply: we have not timed a cordless vacuum for this page and we have no test bench, and none of the four manufacturer pages we read named a test standard behind its runtime figure. We have not claimed that no such standard exists — only that it was not stated, which is why the numbers cannot be checked against one another.