Proscenic 850T 14.8V Replacement Battery 3400mAh Li-ion

Proscenic 850T / 850P — 14.8V Li-ion Replacement Battery (CMICR18650F8M7-4S1P)

This is a 14.8V, 3400mAh Li-ion battery pack for the Proscenic 850T and 850P cordless stick vacuums. It replaces part number CMICR18650F8M7-4S1P and fits directly into the battery slot on both models. Capacity is 50.32Wh — matched to the original specification.

• 850T and 850P compatibility: Both models run the same 14.8V four-cell series configuration and share an identical battery housing and connector. The BMS handshake protocol is the same across both, so one cell pack covers the full range.
• Bench tested on actual hardware: We cycled this pack through motor-start loads on the 850T platform. The BMS held steady through sustained suction cycles and cut off cleanly at the low-voltage threshold without nuisance tripping under normal floor cleaning draws.
• Dock charging habit on the 850T: Do not leave the vacuum sitting on the charging dock continuously. Cordless vacuums held on trickle charge develop measurable capacity fade faster than those removed from the dock once fully charged. Charge to full, then disconnect.

Suction dropping before the battery indicator reaches low

The 850T's motor controller pulls more current when airflow is restricted — a partially blocked filter forces the motor to work harder, which pulls the cell voltage down faster than the indicator expects. The indicator reads state-of-charge, not load-adjusted voltage, so it can still show mid-range while suction has already degraded. This is not a battery fault. Clean or replace the filter and retest — suction recovery under a clean filter confirms the cells are fine. If suction still drops with a clean filter, check the voltage under load; a healthy pack holds above 13.5V during normal operation.

Motor cuts out mid-clean and then restarts after a pause

This is a BMS overcurrent trip, not a dead battery. When the 850T's brush roll or intake is partially blocked, sustained restricted airflow causes motor current to spike beyond the BMS protection threshold — the pack shuts output to prevent cell damage. After a short rest, voltage recovers and the BMS resets, which is why the vacuum powers back on. The fix is to clear the blockage: check the brush roll for hair wrap and inspect the filter for loading. If the motor cuts out on a clean, unblocked vacuum, measure resting pack voltage — it should read 16.4V after a full charge.