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 | Material : ABS Cleaner Types: Vacuum Cleaner Function: Suction Feature: Auto Noise (dB): 35 - 50dB Voltage(V): 3.7V Charging Time: 40 - 60mins Working Time: 40min Operation Range: 15m |
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Battery Information | Battery Voltage: 3.7V |
Dimensions and Weight | Product weight: 0.3000 kg Package weight: 0.4100 kg Product size (L x W x H): 18.00 x 18.00 x 6.00 cm / 7.09 x 7.09 x 2.36 inches Package size (L x W x H): 19.00 x 19.00 x 8.50 cm / 7.48 x 7.48 x 3.35 inches |
Package Contents | Package Contents: 1 x Cleaner Robot, 1 x USB Cable |