UWANT X100 28.8V Cordless Vacuum Replacement Battery 4000mAh

UWANT X100 Series — 28.8V Li-ion Replacement Battery (INR18650)

This is a 28.8V, 4000mAh (115.2Wh) Li-ion replacement battery pack for the UWANT X100, X100 Pro, and X100 S cordless stick vacuums. It restores full motor power when the original cell degrades after repeated charge cycles. The INR18650 cell format matches the original pack's voltage rail and BMS configuration.

• X100, X100 Pro, and X100 S compatibility: All three models run the same 28.8V motor rail and use the same battery housing and connector. The BMS on each unit reads cell voltage the same way, so one pack covers all three variants without modification.
• Bench tested on actual hardware: We ran this pack through full charge and discharge cycles on the X100 motor platform. The BMS held stable across sustained suction loads and triggered overcurrent protection correctly under simulated blockage conditions without false trips at normal operating draw.
• Dock charging behaviour on UWANT vacuums: Do not leave the X100 on the charging dock continuously. These vacuums trickle-charge when docked, and cells held near full charge under continuous low current develop capacity fade faster than cells cycled properly. Charge to full, then remove from the dock.

Cordless vacuum losing suction before the battery indicator reaches low

This is a voltage sag issue, not a capacity issue. When the X100 motor pulls current through a partially blocked filter or a heavy-pile carpet, internal resistance in a degraded cell causes pack voltage to drop below the motor's operating threshold before the indicator registers low. The vacuum reads average cell voltage, not instantaneous load voltage. A fresh 28.8V pack with lower internal resistance holds voltage under load, which is why suction stays consistent across a full clean cycle rather than fading partway through.

Motor cuts out mid-session and recovers after a short pause

This is the BMS tripping on overcurrent, not a battery fault on its own. On the X100, a blocked filter or full dust bin forces the motor to draw above rated current trying to maintain suction — the BMS cuts power to protect the cells. After the pack cools briefly, it resets and the vacuum runs again. Check the filter and bin first. If the motor cuts out on a clean filter with a new pack, check that pack voltage reads at least 29.0V off the charger before first use.