Cordless vacuums trade unlimited mains power for portability. The right model depends less on the largest suction claim and more on the size of the home, floor mix, tool design and how much maintenance you will actually perform.
Runtime should be matched to cleaning mode
Headline runtime is often measured on a low-power setting without a motorized floor head. Higher suction settings and powered tools can reduce runtime substantially. Compare manufacturer test conditions and look for runtime information in the mode you expect to use.
The floor head is as important as the motor
Soft rollers can work well on hard floors, while brush rolls help agitate carpet. Homes with both surfaces may benefit from interchangeable heads or a head designed to transition between them. Long hair can wrap around brushes, so access for cleaning matters.
Battery replacement affects useful life
A removable battery can be replaced when capacity declines and may allow a second pack for larger homes. Built-in batteries can reduce bulk but may be harder to service. Check the manufacturer availability and price of replacement packs before purchase.
Bin size changes how often you stop
Compact stick vacuums have small dust bins. Emptying frequency matters in homes with pets or large floor areas. Look at how the bin opens and whether debris must be pulled out by hand.
Filters require routine care
Washable filters need drying time; replaceable filters create an ongoing cost. Follow the manual because installing a damp filter or operating without a required filter can damage some machines.
Weight distribution affects above-floor cleaning
Two vacuums with similar total weight can feel different if the motor and battery are concentrated near the hand. If you clean stairs or shelves frequently, balance and tool attachment can matter more than total weight alone.
Bottom line
Cordless vacuums are convenience tools. Choose around realistic runtime, floor-head design and serviceable batteries rather than a single suction headline.