TCL R1 Cordless Vacuum Replacement Battery 14.4V 3500mAh

TCL R1 / R2 / R3 Cordless Vacuum — 14.4V Ni-MH 3500mAh Replacement Battery

This is a 14.4V Ni-MH replacement battery rated at 3500mAh (50.4Wh) for the TCL R1, R2, and R3 cordless vacuum cleaners. It fits the existing battery compartment and connects to the same charging circuit as the original cell. Replace this when the original pack no longer holds a useful charge or fails to charge at all.

• R1, R2, and R3 compatibility: All three models run the same 14.4V voltage rail with an identical battery housing and connector pin layout. The BMS threshold across this range is consistent, so one replacement cell covers all three without modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a TCL R1 unit. The BMS accepted the handshake on first connection, held voltage within spec under sustained motor load, and tripped overcurrent protection correctly when airflow was deliberately blocked.
• Dock charging behaviour on Ni-MH cells: Do not leave this vacuum sitting on the charging dock continuously. Ni-MH chemistry is sensitive to trickle charge over time — capacity fade accelerates significantly on cells that stay docked between every short use. Charge to full, then remove from the dock until the battery is depleted.

Suction dropping before the battery indicator reaches low

This is a voltage sag issue, not a capacity issue. When the motor encounters increased resistance — from a partially blocked filter or a heavy carpet load — it draws more current than rated. On a Ni-MH cell, elevated current draw causes an immediate voltage drop at the terminals, which the vacuum's motor controller reads as low battery. Cleaning the filter fully is the first fix. If sag persists on a clean filter, the cell itself may have degraded internal resistance, and replacement is the correct next step.

Motor cuts out mid-use then recovers after a few seconds

This is a BMS overcurrent trip, not a motor fault. It happens when restricted airflow forces the motor to work harder, pulling current past the BMS protection threshold — the BMS shuts the circuit, then resets after the thermal or time delay clears. The motor itself is usually fine. Remove and clean the filter, check the dust container, and clear any blockage at the floor head. If cutouts continue on a clean, unblocked machine, measure resting cell voltage — a healthy Ni-MH pack at full charge should read at or above 15.6V across 13 cells.