About this replacement
Xiaomi Mijia 1C / K10 Series — 25.2V Li-ion Replacement Battery (MJWXCQ04ZM)
This is a 25.2V 2500mAh (63Wh) Li-ion battery for the Xiaomi Mijia 1C cordless stick vacuum cleaner. It also fits the Mijia 1C Lite, K10, and SCWXCQ02ZHM. Swap it in when the original pack no longer holds enough charge to complete a cleaning session.
- Mijia 1C and K10 platform fit: These models share the same 25.2V bus, connector pinout, and BMS communication protocol. One battery pack covers the full compatibility list without any adapter or modification.
- Bench tested on actual hardware: We cycled this pack through full charge and discharge on a Mijia 1C unit. The BMS reported cell balance correctly across all stages and the motor controller accepted the pack without fault codes.
- Dock charging habit for stick vacuums: Do not leave the Mijia 1C sitting on the wall dock permanently. Cordless stick vacuums on continuous dock charge develop capacity fade significantly faster than those charged only when the pack is depleted. Charge to full, then remove it from the dock.
Suction dropping before the battery indicator reaches low
This happens when the motor is working harder than normal — usually a partially blocked filter or a restricted airpath. The motor draws more current than rated, which causes the battery voltage to sag under load even when the pack is still largely charged. The BMS interprets this as a cell stress condition and backs off power delivery. Clean or replace the HEPA filter first, then retest suction at full charge.
Motor cuts out mid-clean then restarts after a few seconds
This is a BMS overcurrent trip, not a dead battery. Sustained restricted airflow forces the motor to spike well above its normal draw, and the BMS trips the output to protect the cells. The pack resets itself after the thermal and current conditions normalise — typically within a few seconds. Check the brush roll for hair wrap and the filter for blockage before concluding the battery is at fault. If the pack is fully charged and trips repeat on a clear airpath, verify pack voltage at the terminals — it should read 25.2V at full charge.