AKKU 31215: Battery for Xiaomi Mijia Roborock S50, Li-Ion, 5200 mAh at reichelt elektronik
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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
5600mAh 14.4 V Li-ion Battery for Xiaomi Mi Robot S50 S51 Robot Vacuum Cleaner | eBay
Roborock S5 Advanced Guidance — Replacement for Battery - YouTube