About this replacement
Roborock H7 / H7M1A — 21.6V Li-ion Replacement Battery (9.02.0211)
This is a 21.6V 4000mAh Li-ion replacement battery for the Roborock H7 and H7M1A cordless stick vacuum. It replaces OEM part numbers 9.02.0211 and R200002-17W. Fit this when the original cell no longer holds enough charge to complete a full clean cycle.
- H7 and H7M1A compatibility: Both variants run the same 21.6V battery rail, use the same physical connector, and rely on the same BMS handshake. One battery covers both models without modification.
- Bench tested on actual hardware: We cycled this cell through the H7 charging circuit and verified the BMS accepted the handshake without fault codes. Discharge held stable voltage through sustained high-power cleaning mode.
- Dock charging habit on the H7: The H7 charges via a contact dock. Leaving it docked continuously after a full charge exposes the cell to trickle current that accelerates capacity fade. Charge to full, then remove the vacuum from the dock until the next use.
Suction dropping before the battery indicator reaches low
The H7 motor draws significantly more current when the filter is partially blocked or the suction path is restricted. This pulls the cell voltage down faster than the indicator circuit expects, so the vacuum feels underpowered while the display still shows adequate charge. The BMS reads true cell voltage, not a time-averaged estimate, so a restricted motor can sag the pack to 18–19V under load while the indicator lags behind. Clean the filter and check the suction path before assuming the battery is at fault.
Motor cuts out mid-clean and then recovers after a pause
This is a BMS overcurrent trip, not a dead battery. When the H7 motor stalls or is sustained at high load — typically from a blocked roller brush or clogged filter — current spikes beyond the BMS threshold and the pack disconnects to protect the cells. The BMS resets after a short cooldown, which is why the vacuum restarts. Check the roller brush for hair wrap and inspect the filter before running again. If the trip repeats with a clean filter and clear brush, confirm the replacement cell's BMS is rated for the H7's peak draw.