Tefal RG 6825 WH Cordless Vacuum Replacement Battery 14.4V 2600mAh

Tefal RG 6825 WH / RG 6871 WH Series — 14.4V Li-ion 2600mAh Replacement Battery

This is a 14.4V lithium-ion replacement battery rated at 2600mAh (37.44Wh), built to fit the Tefal RG 6825 WH and related cordless stick vacuums. It replaces the original cell when capacity has degraded and suction performance has dropped. Fit models include the RG 6825 WH, RG 6871 WH, RG 6875 WH, RG 6971 KO, and over 35 additional variants in this range.

• Multi-model compatibility across the RG series: These vacuums share the same 14.4V battery platform, connector format, and BMS handshake requirements. A single cell replacement covers the full range without modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the RG series platform. The BMS responded correctly to charge termination and overcurrent thresholds without tripping or refusing to initialise.
• Dock charging habit for this vacuum: Do not leave the vacuum seated on the charging dock permanently. Continuous trickle charging on these vacuums degrades cell capacity faster than intermittent charge cycles. Charge to full and remove from the dock.

Suction dropping before the battery indicator reaches low

On the RG series, the motor draws significantly more current when the filter is partially blocked. This pulls the cell voltage down faster than the indicator circuit expects, so the vacuum feels underpowered while the LED still shows charge remaining. The BMS reads a voltage sag — not a depleted cell — and may reduce output to protect the pack. Clean or replace the filter first, then retest suction at full charge.

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

This is a BMS overcurrent trip, not a faulty battery. It occurs when sustained restricted airflow — usually a blocked filter or partially blocked nozzle — forces the motor to draw beyond the BMS current limit. The BMS cuts power to protect the cells, then resets after the pack temperature drops. Clear the blockage, check the filter, and confirm the voltage reads above 12.6V on a full charge before ruling out cell degradation.