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A rechargeable robot vacuum cleaner runs on a lithium-ion battery that charges at its docking station between cleans. Most models deliver 90–150 minutes of runtime on a single charge. When the battery runs low mid-clean, the robot returns to dock, recharges and resumes exactly where it left off. Charge times range from 2–5 hours. Battery capacity degrades over time — check whether the manufacturer sells replacement packs. Higher suction modes drain the battery faster, so runtime figures quoted at maximum power differ significantly from eco-mode estimates.
