- Care & Maintenance
Maintaining your cordless vacuum cleaner: filter, brush, and battery
Most devices don't lose suction power because of wear but because of a clogged filter. What needs to be done regularly.
See us more on GoogleKey takeaways
- Decreasing suction power is almost always due to the filter—not the motor and not the battery.
- Rinsed filters must dry completely, at least 24 hours. If used damp, they can damage the device.
- For longer breaks, store the battery at about half charge and in a cool place, not permanently on the charger.
A cordless vacuum cleaner has few wear parts but is sensitive to neglect. If suction power drops after a few months, the motor is rarely to blame: usually fine dust is trapped in the filter, or hair blocks the brush roll. Both can be fixed in a few minutes.
What to do and how often
The following steps keep the device at peak performance. The effort is minimal; consistency is what matters.
- After every use: Empty the dust container. If the dirt remains, it compacts and clogs the pre-filter.
- Weekly: Remove the brush roll and cut away tangled hair with scissors. Many rolls have a guide groove for this.
- Monthly: Rinse the filter under running cold water until the water runs clear—without dish soap and without a brush.
- Every six months: Check the suction tube and nozzles for blockages, wipe the contacts on the battery dry.
Treat the battery correctly
Lithium-ion batteries age even when not in use, and they age fastest at full charge and in heat. For everyday life, this means the device doesn't need to sit in the charging station permanently. If a longer pause is coming up – such as a vacation – storing it at around 50 percent charge in a cool place is the most gentle option.
Frequently asked questions
Why does my cordless vacuum cleaner suddenly lose suction?
In most cases, the filter is clogged. Take it out and hold it up to the light—if the fleece is gray instead of white, it should be rinsed. The second most common cause is hair on the brush roll.
Is it okay to leave the vacuum cleaner in the charging station permanently?
For daily use, this is not a problem; modern devices don't overcharge. However, over time, the battery ages faster at full charge. Before longer breaks, it's worth storing it at half charge in a cool place.
Can I clean the dust container in the dishwasher?
No. The heat warps the plastic and damages the seals. The container can be rinsed with clear water and must then be left to dry completely, just like the filter.
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About the author
Home & garden editor
Miriam looks after the home and garden guides at cybermag – from robot vacuums and washing machines to lawn mowers. She is less interested in spec sheets than in what still works after two years of everyday use.
Facts checked and approved for publication by Miriam Kohl · as of August 27, 2026 · How our texts are written →