Eufy RoboVac 11 14.4V Replacement Battery PA04 2600mAh

Eufy RoboVac 11 / 11S / 12 Series — 14.4V Li-ion Replacement Battery (PA04)

This is a 14.4V 2600mAh (37.44Wh) Li-ion replacement battery for the Eufy RoboVac 11, 11S, 11S Max, RoboVac 12, and over 29 additional compatible models. It slots into the battery compartment on the underside of the robot and powers the suction motor, brush system, and navigation electronics. OEM part numbers PA04 and C0914E1 both cross-reference to this cell configuration.

• RoboVac 11 series compatibility: The 11, 11S, 11S Max, and 12 all share the same 14.4V battery rail, connector pinout, and BMS handshake protocol — that is why one cell fits across this range without firmware or wiring differences.
• Bench tested on actual hardware: We ran this battery through full charge and discharge cycles on RoboVac 11S hardware. The BMS correctly flagged overcurrent events during restricted-suction simulation and recovered cleanly after the blockage was cleared.
• Dock charging discipline for RoboVac units: Do not leave the RoboVac sitting on the charging dock continuously between uses. These robots trickle-charge when docked and at rest — that sustained low-level current accelerates cell degradation. Charge to full, then remove the unit from the dock until the next cleaning cycle.

Suction dropping before the battery indicator reaches low

This happens when the suction motor draws more current than the BMS expects — usually caused by a partially blocked filter or brush roll, not a failing battery. The BMS reads a voltage sag under that elevated load and begins throttling motor power to protect the cells, even though the battery still holds a reasonable charge. The result looks like early battery death but is actually the protection circuit doing its job. Clear the filter and brush roll, then check whether full suction returns across a complete cycle before concluding the battery needs replacement.

Motor cuts out mid-clean then restarts on its own

This is a BMS overcurrent trip, not a dead battery. When the suction path is restricted — blocked inlet, saturated filter, tangled brush — the motor stalls briefly and draws a spike of current that exceeds the BMS threshold. The BMS cuts power to protect the cells, the robot pauses, then the BMS resets and the motor restarts. It will keep cycling like this until the restriction is removed. Clean the filter and check the inlet before assuming a battery fault — if the problem stops after clearing the blockage, the battery is working correctly at 14.4V nominal.