Neato D8 Replacement Battery 14.4V 6400mAh 945-0381

Neato D8 / D9 Series — 14.4V Li-ion Replacement Battery (945-0381)

This is a 14.4V, 6400mAh lithium-ion battery for the Neato D8, Robotics D8, D9, and Botvac D9 robotic vacuum cleaners. It replaces OEM part numbers 945-0381, 945-0376, 945-0382, 205-0023, 205-0021, 205-0026, and 205-0022. When the original cell degrades and the robot can no longer complete a cleaning cycle, this battery restores full operation.

• D8 and D9 platform fit: These models share a common 14.4V battery bay, connector pinout, and BMS handshake protocol. The D8 and D9 use the same physical cell format — 199.80 × 45.80 × 32.20mm — so one part number covers both lines without modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the D9 platform. The onboard BMS accepted the replacement without fault codes, held the 14.4V nominal rail through suction motor start, and balanced cells correctly across charge termination.
• Dock charging habit on the D8 and D9: Do not leave the robot sitting on the dock continuously between uses. Permanent dock contact keeps the cell in a trickle-charge state that accelerates capacity fade. Charge to full, then remove the robot from the dock until the next scheduled clean.

Suction dropping before the battery indicator reaches low

The D8 and D9 suction motors draw significantly more current when filters are partially blocked. As internal resistance rises in an aging cell, voltage sags under that elevated load — dropping below the motor's effective operating threshold while the indicator still reads mid-charge. The BMS reports state-of-charge from voltage at rest, not under load, so the indicator lags the real drop. Replacing the cell removes the high internal resistance and restores the voltage margin the motor needs to hold suction at full draw.

Robot returns to dock mid-clean and won't restart

This happens when the BMS trips on an overcurrent event — usually sustained restricted suction pulling more than the rated motor current. The robot interprets the BMS cutoff as a low-battery state and docks itself. The cell recovers voltage within minutes at rest, which is why the robot sometimes resumes when you manually restart it. Clean the filter first; if the behaviour continues after filter service, the original cell's capacity has faded enough that even normal suction draws exceed what the BMS will allow — replace the battery and check the filter monthly.