Frequently Asked Questions
What is the difference between battery life and runtime on a robot vacuum?
Battery life and runtime both describe how long a robot vacuum can work before needing to recharge — runtime is the actual time it cleans on a single charge, similar to how your phone battery lasts a certain number of hours.
How does a robot vacuum’s battery work?
Inside every robot vacuum is a rechargeable lithium-ion battery that drains as the vacuum moves, sucks up dust, and spins brushes; when the battery gets low, it automatically returns to its dock to recharge.
Why does runtime matter when choosing a robot vacuum for my home?
Runtime directly affects whether the vacuum will clean your entire home — if you have a large house and the vacuum only runs for 60 minutes, it might finish some rooms but run out of power before reaching others, forcing you to wait for a recharge.
Does a robot vacuum’s battery degrade over time?
Yes, over 2–3 years, all rechargeable batteries lose their ability to hold a charge, so a vacuum that originally ran for 120 minutes might only last 90 minutes after a couple of years of use.
The bottom line
Battery life and runtime are genuinely important specs that affect how well a robot vacuum works in your home — they’re not just marketing fluff. The key is matching the runtime to the size of your space: smaller homes need 60–90 minutes, while larger homes benefit from 120+ minutes. Keep in mind that all batteries age, so expect your vacuum’s runtime to drop by 10–20% after a few years of use. If you’re buying for a large house or you want the vacuum to handle multiple cleaning sessions without your help, invest in a model with a longer runtime; if you have a modest-sized home, you can save money with a shorter runtime and won’t notice the difference.