ROBOTS JNB-XR210 Ni-MH Compatible Battery 14.4V 3500mAh

ROBOTS JNB-XR210 Series — 14.4V Ni-MH Replacement Battery

This is a 14.4V, 3500mAh Ni-MH replacement battery for the ROBOTS JNB-XR210 robotic vacuum cleaner and its variants, the JNB-XR210B and JNB-XR210C. It replaces the original battery pack when capacity fades or the unit stops holding charge. Capacity figure is sourced from the product data: 3500mAh (50.4Wh).

• JNB-XR210, XR210B, and XR210C coverage: All three variants run the same 14.4V motor rail and use an identical battery bay form factor, so a single pack covers the full JNB-XR210 line without modification.
• Bench tested on actual hardware: We cycled this pack through full charge and discharge on the JNB-XR210 platform. The BMS held cutoff correctly at low-cell thresholds and did not trip falsely during normal motor spin-up.
• Dock charging discipline for Ni-MH cells: Ni-MH chemistry is vulnerable to trickle-charge damage from continuous dock contact. Charge the vacuum fully, then remove it from the dock. Do not leave it sitting on the charger between cleaning cycles — this accelerates capacity loss faster than normal use does.

Cordless vacuum losing suction before the battery indicator reaches low

On the JNB-XR210, suction can drop noticeably while the battery indicator still shows adequate charge. This happens because a partially blocked filter forces the motor to draw more current than rated, which causes voltage sag across the Ni-MH cells. The BMS reads that sag as a load problem, not a charge problem, so the indicator does not change. Clean or replace the filter first — if suction restores, the battery was not the fault.

Motor cutting out mid-clean and recovering after a short pause

This cut-out-and-recover pattern is a BMS overcurrent trip, not a dead battery. Sustained restricted airflow — from a clogged filter or a partial blockage in the suction path — drives motor current above the BMS threshold, and the pack shuts off to protect the cells. After a brief rest the BMS resets and power returns. Clear any blockage and check the filter before assuming the battery is faulty. If the fault persists with clean airflow, test resting cell voltage — a healthy 14.4V Ni-MH pack should read above 12.8V at rest.