Miele HX1 Replacement Battery 25.2V 2500mAh Li-ion

Miele HX1 / HX2 Series — 25.2V Li-ion Replacement Battery (1010042)

This 25.2V, 2500mAh (63Wh) lithium-ion battery replaces the original power cell in the Miele HX1 and HX2 cordless stick vacuum range. It fits the standard HX1, HX1 Facelift, HX2, and HX2 Pro among other models in the series. When the original cell degrades and suction drops off early, swapping this battery restores the vacuum to its full power draw.

• HX1 and HX2 series fitment: These models share the same 25.2V battery architecture, connector format, and BMS handshake requirements across the range. The OEM part numbers 1010042 and 11384710 — along with AP01, AP02, AP03, and HS19 cross-references — all map to this single cell configuration, so one replacement covers the full series.
• Bench tested on actual hardware: We cycled this battery under sustained motor load and confirmed the BMS holds the full 25.2V nominal rail through high-suction operation. The protection circuit tripped correctly on overcurrent and recovered cleanly once load was removed — no latching faults observed.
• Dock charging habit on the HX1/HX2: Do not leave the vacuum sitting on the charging dock permanently between uses. Continuous dock contact delivers a low-level trickle that accelerates capacity fade in this cell. Charge to full, then remove the vacuum from the dock until the next use.

Suction dropping before the battery indicator reaches low

The HX1 and HX2 motors draw significantly more current when the filter is partially blocked — the vacuum works harder to maintain airflow, pulling the battery voltage down faster than the indicator circuit expects. The indicator reads state-of-charge, not motor load, so it can still show two bars while suction has already collapsed. This is a voltage sag issue, not a faulty battery. Clean or replace the filter first, then recharge to full — if suction holds at full voltage after that, the battery is not the problem.

Motor cuts out mid-clean then restarts after a few seconds

This is a BMS overcurrent trip, not a failed motor or dead battery. When sustained restricted airflow — usually a blocked filter or a hair tangle at the brush head — forces the motor to draw above the BMS threshold, the protection circuit cuts power and holds for a short recovery window before resetting. The vacuum coming back on after a pause is the BMS resetting, not a loose connection. Clear the restriction, wait for the BMS to fully reset, then restart — the cell voltage should sit above 22V at rest if the battery itself is healthy.