Tefal TY846384 12V Cordless Vacuum Replacement Battery 2000mAh

Tefal TY846384/9A0 Series — 12V Ni-MH Replacement Battery

This is a 12V, 2000mAh Ni-MH replacement battery for the Tefal cordless stick vacuum range. It fits the TY846384/9A0, TY843884/9A0, TY843184/9A0, TY8479KM/9A0, and five additional models in this lineup. The battery powers the suction motor and motorized cleaning head directly.

• TY84 series compatibility: These models share a common 12V battery bay, connector pinout, and BMS communication protocol. Swapping the cell restores full motor voltage without any modification to the dock or unit.
• Bench tested on actual hardware: We ran this battery under sustained suction load across carpet and hard floor cycles. The BMS held the correct voltage rail throughout and did not trip on motor start draw.
• Dock charging habit: Do not leave this vacuum sitting on the charging dock permanently. Continuous trickle charge on Ni-MH cells accelerates capacity fade — charge to full, then remove from the dock until the next use.

Cordless vacuum losing suction before the battery indicator reaches low

This happens when a partially blocked filter forces the motor to draw more current than rated. The battery voltage sags under that extra load, and the motor slows — even though the indicator still shows charge remaining. The indicator reads cell voltage at rest, not under load, so it lags behind real performance. Clean or replace the filter first before concluding the battery is at fault.

Motor cuts out mid-clean, then recovers after a short pause

This is a BMS overcurrent trip — not a dead battery. When sustained suction restriction (blocked filter, hair wrap on the brush roll) pulls current past the BMS threshold, the pack disconnects to protect the cells. The brief pause allows the BMS to reset and re-enable output. Clear the blockage, check the filter, then resume. If it trips immediately again on a clean unit, confirm battery voltage sits above 11V before charge.