About this replacement
GRE Electric Vac Plus VCB50 — 11.1V Li-ion Replacement Battery (P1116ZJ4BU)
This is an 11.1V, 5200mAh Li-ion replacement battery for the GRE Electric Vac Plus VCB50 cordless vacuum cleaner. It slots into the original battery bay and restores full suction power to the unit. The OEM part number is P1116ZJ4BU.
- VCB50 platform fit: The Vac Plus VCB50 runs a three-cell Li-ion pack at 11.1V nominal. This replacement matches that voltage rail and connector pinout, so the vacuum's motor controller reads the pack correctly on startup.
- Bench tested on actual hardware: We ran this pack through full charge and discharge cycles on the VCB50 platform. The BMS engaged overcurrent protection correctly under sustained motor load and released cleanly once load was removed — no latching faults observed.
- Dock charging on the VCB50: Do not leave the vacuum sitting on the charging dock continuously. The VCB50 dock does not cut power once the pack reaches full charge. Sustained trickle current accelerates cell capacity loss. Charge to full, then remove the vacuum from the dock.
Suction dropping before the battery indicator reaches low on the VCB50
The VCB50's battery indicator reads state of charge, not voltage under load. When the filter is partially blocked, the motor draws more current to maintain airflow, which pulls cell voltage down faster than the indicator reflects. The BMS then throttles output to stay within safe discharge limits — the vacuum loses suction while the indicator still shows charge remaining. Clean or replace the filter first, then retest. If suction remains weak with a clean filter, measure pack voltage under load: it should hold above 9.5V during normal vacuuming.
Motor cuts out mid-use then recovers after a few seconds
This is a BMS overcurrent trip, not a dead battery. It happens when the motor is forced to work against a blockage — restricted airflow spikes current draw beyond the pack's rated continuous output. The BMS cuts the circuit to protect the cells, then resets once current demand drops. Check the filter, brush roll, and intake path for obstructions before assuming the battery is at fault. If the motor cuts out on a clear vacuum, check that the replacement pack's BMS reset threshold matches the original — verify pack voltage reads 11.1V (±0.3V) at rest after a cut-out event.