We recommended the Xiaomi Mi robotic vacuums, because of it's 5200mAh Large Capacity Battery.
The detail tips for choosing a vacuum cleaner, you can read this post:
Robot vacuum cleaner buying guideGeneral | Materials: ABS Available Color: Black,White |
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Dimensions and Weight | Product weight: 0.5840 kg Package weight: 0.6980 kg |
Package Contents | Package Contents: 1 x Intelligent Sweeping Robot Machine, 1 x USB Cable |