Amazon.com: Battery Replacement for Mi Robo Mijia S50 Mijia S51 Millet Sweeper BRR-2P4S-5200S Sweep One S51 S6 Sweep One S55 Sweep One S50 : Health & Household
Amazon.com: Tenberly Lithium Replacement Battery for Xiaomi Roborock S5 S7 S6 S51 S50 S52 S53 S55 T6 T7 T61 T65 C10 E4 Xiaowa CT10 E20 E35 Series 5200mAh Real Capacity : Home
Melasta 14.8V 5300mAh Lithium Battery for xiaomi Mijia
5600mAh 14.4 V Li-ion Battery for Xiaomi Mi Robot S50 S51 Robot Vacuum Cleaner | eBay