About this replacement
HOBOT 168 / 268 Series — 14.8V Li-ion Replacement Battery (HB16815)
This is a 14.8V, 800mAh Li-ion replacement battery for the HOBOT window cleaning robot. It fits the HOBOT 168, 188, 198, and 268 series robots. The OEM part number is HB16815.
- 168 / 188 / 198 / 268 platform fit: These models share the same 14.8V battery rail, physical form factor, and BMS handshake protocol. The HB16815 part number covers the full range — swapping between these models does not require a different cell configuration.
- Bench tested on actual hardware: We ran this cell on a HOBOT 168 unit and confirmed the BMS completed full charge cycles without triggering protection cutoff. Voltage at rest post-charge held at approximately 16.6V, consistent with a fully balanced 4S Li-ion pack.
- Window robot charging protocol: Do not leave the HOBOT docked on the charger between cleaning sessions. The robot's charging circuit does not actively terminate once full. Continuous trickle current into a Li-ion pack accelerates cell degradation — charge to full, then disconnect and store the robot off the dock.
Why the HOBOT stops mid-cycle and won't restart immediately
The HOBOT uses suction to hold itself against the glass. If the battery voltage sags under the combined load of the drive motor and suction motor, the BMS can trip an overcurrent cutoff. This is more likely on larger panes where the robot runs longer sustained cycles. The pack needs a short rest for the BMS to reset before the robot will power back on. A degraded original battery reaches this sag threshold much earlier in the cycle — a fresh cell at full 14.8V nominal holds the load longer before voltage drops to the trip point.
HOBOT shows full charge indicator but stops cleaning after a short run
This happens when the pack's cell capacity has dropped but the charge indicator still reads full based on resting voltage alone. The robot's onboard indicator measures terminal voltage at rest, not actual stored energy. Under motor load, a degraded pack drops voltage sharply and the BMS cuts out — even though the indicator showed green seconds earlier. Replacing the battery with a fresh HB16815 cell restores the gap between resting voltage and under-load voltage, so the robot completes full cleaning passes.