S50 S51 S55 Battery Replacement for Xiaomi Mi Robot Vacuum / Roborock — 14.4V 5200mAh

The S50/S51/S55 is a high-capacity 14.4V 5200mAh (74.88Wh) Li-ion replacement battery for Xiaomi Mi Robot Vacuum Cleaner (Mijia 1, 1S, 2) and Roborock S50, S51, S55, T4, T6, C10 and E35 series. Built with premium cells to ensure stable cleaning runtime and original-level energy density, it features an integrated BMS to protect against overcharge and short circuits. Restores your robot vacuum's ability to clean large areas in a single charge. 100% brand new, backed by a 1-year warranty.

Product Specifications

Battery Model	S50 / S51 / S55
Capacity	5200mAh / 74.88Wh
Voltage	14.4V
Battery Type	Li-ion
Color	Orange
Condition	100% Brand New Replacement
Warranty	1-Year Warranty

Replace Part Numbers

• S50
• S51
• S55

Compatible Models

• Xiaomi Mijia 1 / 1S / 2
• Roborock S50 / S51 / S55
• Roborock T4 / T6 / C10 / E35

FAQ

Q: Will this battery improve my robot vacuum's runtime? A: Yes — the 5200mAh high-capacity cells match the original specifications, restoring your vacuum's ability to cover larger floor plans without returning to the dock prematurely. Q: Is this battery safe to leave on the charging dock overnight? A: Absolutely — our battery includes a sophisticated BMS that manages charging cycles and automatically stops current flow when the cells reach 100%, ensuring long-term safety and cell health.