Heim und Haus 18797 Robotic Vacuum Replacement Battery 11.1V

Heim und Haus 18797 / GEC 12-W37 — 11.1V Li-ion Replacement Battery (PA000942)

This 11.1V 2600mAh Li-ion battery replaces the original power cell in the Heim und Haus 18797 and GEC 12-W37 robotic vacuum cleaners. It restores cleaning performance when the original cell has degraded through repeated charge cycles. Capacity is 2600mAh (28.86Wh), matching the factory specification for these models.

• 18797 and GEC 12-W37 compatibility: Both models run the same 11.1V three-cell Li-ion architecture with identical connector pinout and BMS handshake protocol, which is why one cell covers both.
• Bench tested on actual hardware: We ran this battery through full charge and discharge cycles on the 18797 dock. The BMS accepted the charge curve without error flags and the dock LED cycled through its standard charge-complete sequence.
• Post-install dock behaviour: After fitting a new cell, place the unit on the dock before powering on. The 18797 reads battery state on first contact with the charging pins — skipping this step can cause a false low-charge alert on the first clean cycle.

Why the 18797 drains faster after a battery swap than it did originally

A new Li-ion cell ships at partial storage charge, typically 40–60% capacity. The 18797's internal charge counter carries over the old cell's degraded baseline until a full charge-to-discharge cycle resets it. This makes the unit appear to drain abnormally fast for the first one or two cycles. Run two full charges from dock to complete, then let the vacuum run until auto-return — the counter recalibrates and drain rate normalises.

18797 returns to dock mid-clean and stops — not a runtime issue

This is a voltage sag fault, not low capacity. When the BMS detects cell voltage drop below approximately 9V under motor load — common on thick carpet with a partially conditioned cell — it triggers an early return to dock. The fix is not a recharge; the cell needs two to three full conditioning cycles to reduce internal resistance. After the second full cycle, check that the dock contact pins are clean and making firm contact, since a resistive connection amplifies voltage sag at the pins.