Robotic U290 Cordless Vacuum Replacement Battery 14.4V 2800mAh

Robotic U290 — 14.4V Ni-MH Replacement Battery

This is a 14.4V, 2800mAh Ni-MH replacement battery for the Robotic U290 robotic vacuum cleaner. It fits directly into the U290 and restores power to the motor drive and suction system. Capacity is rated at 40.32Wh, matching the original cell specification.

• U290 platform fit: The U290 runs a 14.4V motor rail with a Ni-MH cell pack. This replacement matches that voltage and uses the same connector orientation and cell count, so the vacuum's onboard controller sees no difference at startup.
• Bench tested on actual hardware: We cycled this pack through full charge and discharge on a U290-class motor load. The BMS held the discharge curve stable through the working voltage window and did not trip on motor start current.
• Dock charging on the U290: Do not leave the U290 sitting on the charging dock between uses. Ni-MH cells under continuous trickle charge develop capacity fade faster than those charged only when depleted. Charge to full, then remove the vacuum from the dock.

Suction dropping before the battery indicator reaches low on the U290

The U290 motor draws harder under load — thick carpet, debris buildup, or a partially blocked filter all increase current demand. When the battery pack's internal resistance rises with age, voltage sags under that elevated draw before the state-of-charge indicator registers low. The motor slows, suction drops, but the battery reads as still charged. A fresh cell pack with lower internal resistance holds voltage stable through the same load, so suction stays consistent across the full discharge cycle.

U290 motor cuts out and then recovers mid-run

This is a BMS overcurrent trip, not a dead battery. When the filter is restricted, the motor works against back-pressure and sustained current climbs above the protection threshold. The BMS shuts output, the motor stops, and after a few seconds the pack resets and output resumes. Clean or replace the filter first — if the cutout stops, the filter was the cause. If it continues on a clear filter, the pack's protection threshold has drifted and the cell needs replacing.