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 | Accessories Types: Filter,HEPA |
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Dimensions and Weight | Package weight: 0.0510 kg Package size (L x W x H): 17.00 x 6.00 x 2.30 cm / 6.69 x 2.36 x 0.91 inches |
Package Contents | Package Contents: 2 x Filter HEPA |