About this replacement
Ecovacs Deebot DF45 — 14.8V Li-ion Replacement Battery (M26-4S1P-AGX-2)
This is a 14.8V 2600mAh Li-ion battery for the Ecovacs Deebot DF45 robotic vacuum cleaner. It replaces part number M26-4S1P-AGX-2 and fits the Deebot DF45 and Deebot DF45 Sweeping Robot Cleaner. Voltage and capacity match the original specification exactly.
- Deebot DF45 compatibility: Both the DF45 and DF45 Sweeping Robot Cleaner run the same 14.8V four-cell pack architecture with the M26-4S1P-AGX-2 part number. The connector pinout and BMS communication protocol are identical across the two variants, so a single replacement cell covers both units.
- Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on the DF45 platform. The BMS handshake completed correctly, charge acceptance registered without fault codes, and the protection circuit responded to overcurrent conditions as expected.
- Dock charging habit for the DF45: Do not leave the DF45 sitting on its dock permanently between uses. Continuous trickle charge on a Li-ion pack causes measurable capacity fade over weeks. Charge to full, remove from dock, and return it only when the battery needs a top-up.
Suction dropping before the battery indicator reaches low on the DF45
This happens when the motor draws more current than the pack can deliver at full voltage — typically caused by a partially blocked filter or brush roll. Under restricted airflow, the motor works harder, pulling current spikes that force the cell voltage to sag early. The robot reads that sag as a low-battery state and reduces motor power before the charge indicator catches up. Clear the filter and brush roll first, then recheck. A healthy replacement cell should hold above 14.0V under normal suction load.
Motor cuts out mid-clean then recovers after a short pause
This is a BMS overcurrent trip, not a battery capacity issue. When the brush roll jams on carpet fibres or debris, current draw spikes sharply and the protection circuit shuts the output to prevent cell damage. After a few seconds the BMS resets and power returns. The fix is to clear any obstruction from the brush roll and confirm the filter is clean. If trips continue on a clear machine with a new battery, check that the replacement cell's BMS threshold matches the DF45 motor profile — the original M26-4S1P-AGX-2 specification is the reference point.