ProfiCare PC-AKS3034 Replacement Battery 14.8V 2600mAh Li-ion

ProfiCare PC-AKS3034 — 14.8V Li-ion Replacement Battery (EV-678-S148-22)

This is a 14.8V, 2600mAh lithium-ion battery built to the EV-678-S148-22 specification. It fits the ProfiCare PC-AKS3034 cordless vacuum cleaner. Voltage, connector, and BMS handshake match the original cell configuration.

• PC-AKS3034 fit: The PC-AKS3034 runs a 14.8V four-cell Li-ion pack with a specific BMS handshake that controls charge acceptance and discharge cutoff. This replacement uses the same cell count and voltage rail, so the charger recognises the pack without error codes.
• Bench tested on actual hardware: We cycled this pack through full charge and sustained discharge loads that replicate carpet-level motor draw. The BMS held cutoff at the correct low-voltage threshold without nuisance tripping under normal suction load.
• Dock charging on the PC-AKS3034: Do not leave the vacuum sitting on the charging dock permanently. Continuous dock charge on this platform accelerates capacity fade in Li-ion cells. Charge to full, then remove the vacuum from the dock until the next use.

Suction dropping before the battery indicator reaches low

The PC-AKS3034 motor pulls harder when the filter is partially blocked — airflow restriction forces the motor to work against increased resistance. That elevated current draw causes voltage to sag at the cell level before the indicator circuit registers a low-battery state. The vacuum loses suction while the indicator still reads mid-charge because the BMS is reacting to voltage sag, not state of charge. Clean or replace the filter first; if sag continues on a clear filter, the cell pack has likely lost capacity and needs replacement.

Motor cuts out briefly then recovers during use

A momentary cutout followed by recovery is a BMS overcurrent trip — not a wiring fault. It happens when sustained airflow restriction (blocked filter, sealed nozzle, or heavy carpet pile) pushes motor current above the BMS protection threshold. The BMS disconnects the cell pack for a few seconds, then resets once current normalises. Clear the filter and nozzle path, then retest; if the cutout continues on an open airway, measure pack voltage at rest — a healthy cell should read above 15.8V at full charge.