Dibea F20 Max 28.8V Cordless Vacuum Replacement Battery

Dibea F20 Max / F20 Pro — 28.8V Li-ion Replacement Battery (T-DC49L-SAM)

This is a 28.8V Li-ion replacement battery rated at 2500mAh (72Wh), built to fit the Dibea F20 Max and F20 Pro cordless stick vacuums. It slots into the same battery bay as the original and connects to the same BMS handshake the vacuum's motor controller expects. Use it when the original cell no longer holds charge or suction performance has dropped noticeably.

• F20 Max and F20 Pro compatibility: Both models run the same 28.8V motor rail and use the same battery housing geometry and BMS communication protocol. One replacement covers either unit without modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the F20 platform. The BMS negotiated correctly with the vacuum's motor controller — no false low-battery cutoffs and no charging faults on the stock Dibea charger.
• Dock charging habit on the F20 Max: Do not leave the vacuum sitting on the charging dock continuously between uses. Cordless vacuums held at full charge on a live dock develop capacity fade faster than those charged only when depleted. Charge to full, then remove from the dock.

Suction dropping before the battery indicator shows low

This is a voltage sag issue, not a capacity issue. When the filter is partially blocked, the motor draws more current than its rated load. The battery voltage dips under that sustained high draw, and the motor controller responds by reducing power before the fuel gauge registers a low-battery state. The battery itself is not failing — the motor is being starved by restricted airflow. Clean or replace the filter first and retest suction under normal load.

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

This is a BMS overcurrent trip, not a dead battery. When airflow is restricted — blocked filter, blocked brush roll, or a tight carpet pile — the motor pulls sustained high current. The BMS registers an overcurrent condition and cuts output to protect the cells. After a short pause the BMS resets and the vacuum powers back on normally. Clear whatever is restricting airflow, then fully charge the battery before the next run to reset the BMS state cleanly.