Proscenic 850T Replacement Battery 14.4V 2600mAh Li-ion

Proscenic 850T / 850P — 14.4V Li-ion Replacement Battery (CMICR18650F8M7-4S1P)

This is a 14.4V Li-ion replacement battery rated at 2600mAh (37.44Wh) for the Proscenic 850T and 850P cordless stick vacuums. It slots into the same battery compartment as the original and connects to the same BMS handshake circuit. When the factory cell degrades and suction weakens before the indicator hits low, this cell restores full motor voltage.

• 850T and 850P shared platform: Both models run the same 14.4V motor rail and use an identical battery bay with the same connector and BMS communication protocol — one cell covers both.
• Bench tested on actual hardware: We ran this cell through charge cycles on the 850T and monitored BMS cutoff thresholds. The protection circuit held within spec under sustained high-suction load and triggered correctly on overcurrent without nuisance tripping.
• Dock charging habit on the 850T: Do not leave the vacuum sitting on the charging dock between uses. Continuous trickle charge accelerates capacity fade in Li-ion cells significantly 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 850T

This happens when internal cell resistance rises in an ageing battery — voltage sags under motor load even though the resting charge reads normal. The BMS reports adequate charge at rest, but as soon as the motor draws current, terminal voltage drops and the 850T reduces power to the brush motor. A new cell with lower internal resistance maintains voltage under load and restores full suction output from a full charge down to the genuine low-battery threshold.

Motor cutting out mid-clean then recovering after a few seconds

This is a BMS overcurrent trip, not a dead battery. On the 850T, a partially blocked filter forces the motor to draw above its rated current to maintain airflow — the BMS reads this as a fault and cuts the output circuit. The vacuum recovers once current drops back below the trip threshold. Clear the filter first; if the cutout persists with a clean filter on a healthy charge, the cell's internal resistance is too high to sustain the current demand — replace the battery and confirm resting voltage reads 16.4V after a full charge cycle.