Ilife A4S Robotic Vacuum Replacement Battery 14.8V 2200mAh

Ilife A4S / A4 / A6 / V7 — 14.8V Li-ion Replacement Battery (PX-B020)

This is a 14.8V 2200mAh Li-ion replacement battery for the Ilife A4S robotic vacuum and its platform siblings — the A4, A6, and V7. It fits the same physical tray and connects to the same BMS handshake point as the factory cell. Swap it when the original no longer holds enough charge to complete a cleaning cycle.

• A4S / A4 / A6 / V7 platform fit: These models share the same 14.8V four-cell architecture, connector pinout, and BMS communication protocol — which is why one cell works across the full range without any adapter or modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge on an A4S unit. The BMS accepted the handshake without fault flags, and the protection circuit tripped correctly at low-voltage cutoff before the motor could draw the pack below safe floor voltage.
• Dock charging habit: Do not leave the A4S sitting on the charging dock between every run. Continuous trickle charge on this cell chemistry accelerates capacity fade faster than normal cycle aging. Charge to full, then remove the robot from the dock until the next use.

Suction dropping before the battery indicator reaches low

The A4S motor controller scales back power when pack voltage sags under load — even if the indicator still reads mid-level. A partially blocked filter forces the motor to draw more current than rated, which pulls cell voltage down faster than the indicator can track. The result is noticeably weaker suction while the lights still show adequate charge. Clean the filter first; if suction recovers immediately, the battery is not the problem.

Motor cutting out mid-cycle and then recovering after a short pause

This is a BMS overcurrent trip, not a dead battery. When sustained suction restriction drives current above the pack's rated threshold, the protection circuit opens the output to prevent cell damage. After a few seconds the BMS resets and the motor restarts. The fix is to clear the suction path — check the filter, brush roll, and inlet port for blockage — then confirm pack voltage reads at or above 16.0V on a full charge before ruling out the cell itself.