Ilife A4S Robotic Vacuum Replacement Battery 14.8V 2600mAh

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

This 14.8V 2600mAh (38.48Wh) lithium-ion battery replaces the OEM PX-B020 cell in Ilife robotic vacuum cleaners. It fits the A4S, A4, A6, and V7 models, along with 38 additional units in the same platform family. These models share a common voltage rail, connector, and BMS handshake protocol, so one cell covers the full range.

• A4S / A4 / A6 / V7 platform compatibility: All listed models run the same 14.8V four-cell Li-ion architecture with an identical connector pinout and BMS communication line. Swapping cells across this family works because the charging circuit expects the same charge termination signal from any PX-B020-spec pack.
• Bench tested on actual hardware: We ran the pack through charge and discharge cycles on an Ilife A4S unit. The BMS held charge termination at the correct 16.8V ceiling and tripped overcurrent protection cleanly when suction was blocked mid-cycle — no false shutdowns under normal load.
• Dock charging habit for this vacuum: Do not leave the A4S sitting on the dock permanently between uses. These units trickle-charge continuously when docked, and sustained low-current charge degrades cell capacity faster than standard cycle use. Charge to full, then remove the unit from the dock until the next clean.

Cordless vacuum losing suction before the battery indicator reaches low

On the A4S, suction drop under a partial load is rarely a battery capacity problem — it is usually a voltage sag event. When the filter is partially blocked, the motor draws more current than its rated load. The BMS reads the resulting voltage sag as a near-depleted cell and throttles output before the indicator has time to catch up. Clean or replace the filter first, then retest suction performance at full charge.

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

This is an overcurrent trip, not a dead battery. When sustained suction restriction — blocked intake, tangled brush roll, or a clogged filter — forces the motor to pull past the BMS current limit, the BMS cuts output to protect the cells. It resets automatically after a short thermal recovery window, which is why the vacuum restarts on its own. Clear the blockage and confirm the filter is seated correctly. If trips continue on an unblocked unit, measure pack voltage under load — it should hold above 13.5V during normal operation.