Sichler PCR-7500 Compatible Battery 14.8V 3500mAh Li-ion

Sichler PCR-7500 — 14.8V Li-ion Replacement Battery (NX-3368-919)

This is a 14.8V 3500mAh Li-ion replacement battery for the Sichler PCR-7500 cordless vacuum cleaner. It slots into the same bay as the original pack and connects to the same BMS handshake the vacuum's control board expects. Capacity is rated at 51.8Wh — identical to the factory specification.

• PCR-7500 platform fit: The PCR-7500 runs a 14.8V four-cell Li-ion architecture. The battery's connector pinout and BMS communication match the vacuum's charge controller, so the dock charges the pack without triggering a fault state.
• Bench tested on actual hardware: We cycled this pack through repeated motor-load draws and monitored BMS cutoff thresholds. The protection circuit held correctly at undervoltage and overcurrent limits without nuisance tripping under normal suction load.
• Dock charging habit for the PCR-7500: Do not leave the vacuum sitting on the charging dock permanently between uses. Continuous trickle charging on these packs accelerates capacity fade noticeably faster than charging only when the battery is depleted. Charge to full, then remove from the dock.

Suction dropping before the battery indicator reaches low on the PCR-7500

This is a voltage sag issue, not a capacity issue. When the motor draws current against a restriction — a partially blocked filter or full dust container — the cell voltage dips temporarily below the BMS threshold before the indicator registers low. The vacuum's control board reduces motor power to protect the pack, which reads as lost suction. Clean the filter and empty the container first; if suction restores immediately, the battery is not the cause.

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

This is a BMS overcurrent trip, not a failed battery. Sustained restricted airflow — usually a clogged filter — forces the motor to draw beyond its rated current, and the BMS interrupts output to prevent cell damage. The pack resets itself once current demand drops, which is why suction returns after a brief pause. Wash the filter, allow it to dry fully before reinstalling, and confirm the dust container is empty before the next run.