Tineco Floor 2.0 Slim Replacement Battery CL1819 21.6V 4000mAh

Tineco Floor 2.0 Slim — 21.6V Li-ion Replacement Battery (CL1819)

This 21.6V 4000mAh Li-ion battery replaces the OEM pack in the Tineco Floor 2.0 Slim and a broad range of Tineco stick vacuums including the Floor One 1.0, Floor One S3-01, and FM25-01. It slots into the same battery bay and connects via the same multi-pin BMS interface as the original. Capacity is 4000mAh (86.4Wh) — identical to the factory spec.

• Floor 2.0 Slim and compatible Tineco stick vacuums: These models share a common 21.6V battery architecture with a standardised connector and BMS handshake protocol. The Floor One S3-01, Floor One 1.0, and FM25-01 all run the same voltage rail and draw current through the same cell pack geometry, which is why one replacement part number covers all of them.
• Bench tested on actual hardware: We ran this cell through charge-discharge cycles on the Floor 2.0 Slim platform and confirmed the BMS communicates correctly with the vacuum's motor controller. The pack accepted a full charge without fault codes and the low-cell protection cutoff triggered at expected thresholds.
• Dock charging habit on Tineco stick vacs: Do not leave the vacuum on the charging dock permanently. Tineco stick vacs on continuous dock charge develop capacity fade significantly faster than units charged only when the pack is depleted. Charge to full, then remove from the dock.

Suction dropping before the battery indicator reaches low

On the Floor 2.0 Slim, the motor draws more current the moment airflow is restricted — a partially blocked filter forces the motor to work harder, pulling the cell voltage down faster than the indicator reflects. The battery indicator reads state of charge, not load-adjusted voltage, so it can show two bars while the motor is already starved. The vacuum loses suction noticeably before the indicator catches up. Clean or replace the HEPA filter first — on a clear filter, full suction should hold until the indicator genuinely reaches low.

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

This is a BMS overcurrent trip, not a dead battery. When suction is sustained against a blockage — hair wrap at the brush head, blocked inlet, or a saturated filter — current draw spikes past the BMS trip threshold and the pack disconnects to protect the cells. After a few seconds the BMS resets and the motor restarts. Clear the blockage at the brush roll or inlet, then check filter restriction. If the trip repeats on a clear filter and clean brush head, measure resting pack voltage — a healthy cell should read 24V to 25V off charge.