Ecovacs CEN250 Replacement Battery 11.1V 2600mAh Li-ion

Ecovacs CEN250 / ML009 / V700 — 11.1V Li-ion Replacement Battery (ICR18650 3S1P)

This is an 11.1V, 2600mAh lithium-ion battery pack for the Ecovacs Deebot CEN250, ML009, and V700 robotic vacuum cleaners. It replaces the original 3S1P ICR18650 cell configuration that powers the drive motors and navigation sensors through automated cleaning cycles. Capacity figure is taken directly from the product specification — 2600mAh, 28.86Wh.

• CEN250, ML009, and V700 compatibility: These three models share the same 11.1V power rail, physical battery housing, and connector pinout. The BMS handshake protocol across this group is identical, so the same cell pack satisfies all three without modification.
• Bench tested on actual hardware: We ran the pack through charge and discharge cycles on the CEN250 platform. The BMS held cell balancing within expected tolerance across the 3S string, and overcurrent protection tripped correctly when we simulated a stall load on the drive motor.
• Dock charging habit for robotic vacuums: Do not leave the robot sitting on the charging dock permanently between uses. Continuous trickle charge through the dock degrades cell capacity noticeably faster than charging only when the battery is depleted. Charge to full, then remove from the dock until the next scheduled run.

Suction dropping before the battery indicator reaches low

This is a voltage sag problem, not a capacity problem. When the filter is partially blocked, the drive and suction motors draw above their rated current. The increased load pulls cell voltage down under load faster than the indicator circuit tracks it. The robot interprets the sag as a power call and reduces motor speed to protect the BMS, which the user sees as suction loss. Clean or replace the filter first — if the symptom continues on a fresh filter, the cell pack can no longer sustain load voltage above 9.5V under draw.

Motor cuts out mid-cycle then recovers on its own

This is a BMS overcurrent trip, not a battery fault in isolation. A sustained blockage — debris caught in the brush roll, a restricted inlet, or a clogged filter — forces the motor to draw current beyond the BMS cutoff threshold. The BMS opens the discharge circuit to protect the cells, the motor stops, and after a short recovery window the BMS resets and power resumes. Clear the blockage, check the brush roll for tangled debris, and confirm the filter is clean. If the trip happens repeatedly on an unobstructed robot, measure resting pack voltage — a healthy pack at partial charge should read above 10.5V.