About this replacement
Ecovacs Deebot Y1 Series — 14.4V Li-ion Replacement Battery (CS02-LI-1440-5200)
This 14.4V Li-ion battery replaces the original power cell in the Ecovacs Deebot Y1 and Deebot Y1 Plus robotic vacuum cleaners. Capacity is 6700mAh (96.48Wh), matching the voltage rail and BMS handshake the Deebot Y1 platform requires. When the original cell degrades, suction drops early and cleaning cycles shorten — this replacement restores full operating capacity.
- Deebot Y1 and Y1 Plus compatibility: Both models run the same 14.4V architecture and use an identical connector and BMS communication protocol. One cell covers both units without modification.
- Bench tested on actual hardware: We ran this battery through charge and discharge cycles on the Deebot Y1 platform. The BMS accepted the cell correctly, voltage held steady under sustained motor load, and the unit returned to its docking station and recharged without fault codes.
- Dock charging behaviour on the Deebot Y1: Do not leave the Deebot Y1 sitting on its dock permanently between uses. The dock delivers a continuous trickle charge once full, and Li-ion cells kept at 100% under trickle conditions lose capacity measurably faster. Charge to full, then remove from the dock until the next scheduled run.
Suction dropping before the battery indicator reaches low on the Deebot Y1
This happens when internal cell resistance rises as the battery ages. The motor draws higher current under carpet load, and voltage sags below the motor controller's threshold before the fuel gauge registers empty. The vacuum reads sufficient charge but cannot sustain the voltage needed for full suction. A fresh cell with low internal resistance eliminates the sag — if the fault persists after replacement, check the filter for blockage, as a clogged filter forces the motor to draw above rated current regardless of battery condition.
Deebot Y1 stops mid-cycle, then resumes a few seconds later
This is a BMS overcurrent trip, not a motor fault. When the filter is partially blocked, airflow restriction causes the motor to draw sustained current above the BMS cutoff threshold. The BMS shuts the cell output down briefly to protect the pack, then resets once current demand drops. Cleaning the filter typically stops these interruptions. If the problem continues with a clean filter, the cell's protection circuit may be degraded — check resting voltage after a full charge, which should read between 16.6V and 16.8V on a healthy pack.