iRobot Roomba 614 Replacement Battery 14.4V 4000mAh 1800LI

iRobot Roomba 614 / 640 Series — 14.4V Li-ion Replacement Battery (1800LI)

This is a 14.4V, 4000mAh lithium-ion battery for the iRobot Roomba 614 and its close relatives — the 615, 640, 652, and more than two dozen additional Roomba models sharing the same battery bay and connector. It replaces OEM part numbers 1800LI, 2130LI, 4374392, 4376392, 4462425, and 4502233. Fit this when the original cell no longer holds a charge or the Roomba shuts down shortly after leaving the dock.

• 600-series Roomba compatibility: These models share a common 14.4V battery bay, connector pinout, and BMS handshake protocol. Swapping across 614, 615, 640, and 652 units works because the charging circuit and communication lines are identical across the platform.
• Bench tested on actual hardware: We ran this cell on a Roomba 640 through multiple charge and discharge cycles. The BMS responded correctly to the onboard charger, cells balanced without error flags, and the unit completed full cleaning cycles without mid-run cutoff.
• Dock charging habit on the 600 series: Roomba 600-series units left permanently on the Home Base trickle-charge continuously. That sustained low-level current accelerates capacity fade in lithium cells. Charge to full, then lift the unit off the dock until the next clean.

Suction dropping before the battery indicator reaches low

The Roomba's motor pulls more current when airflow is restricted — a partially blocked filter or full bin forces the motor to work harder against back-pressure. That elevated draw causes voltage to sag under load, even when the cell is not depleted. The BMS reads the voltage drop and reduces power to the motor as a protection measure. Clear the filter and empty the bin first; if the problem stops, the battery is fine — the root cause was airflow, not capacity.

Motor cuts out mid-clean and then recovers after a pause

This is a BMS overcurrent trip, not a dead battery. When the Roomba hits thick carpet, a rug edge, or a partial blockage, the motor briefly spikes well above its rated current draw. The BMS opens the discharge circuit to protect the cells, which looks like the unit switching off. After a short pause, the BMS resets and power returns. Check the brush roll for tangled hair or debris jamming rotation — that sustained mechanical resistance is the most common trigger for overcurrent trips on the 614.