Sencor SRV 3150OR Replacement Battery 10.8V 2600mAh

Sencor SRV 3150OR / SRV 3160TQ / SRV 4550WH — 10.8V Li-ion Replacement Battery (SRX 3101)

This is a 10.8V, 2600mAh (28.08Wh) Li-ion replacement battery for the Sencor SRV 3150OR, SRV 3160TQ, and SRV 4550WH cordless stick vacuums. It slots into the same bay as the original pack and connects to the same BMS handshake the charger expects. Capacity figures come from the product data, not a web estimate.

• SRV 3150OR, SRV 3160TQ, SRV 4550WH platform: All three models share the same 10.8V cell architecture, connector pinout, and BMS communication protocol — that is why one pack covers all three. Swapping between them does not require any firmware or charger change.
• Bench tested on actual hardware: We ran the pack through charge and discharge cycles on this platform. The BMS accepted the handshake without faulting, cell balance held within tolerance across cycles, and overcurrent protection tripped correctly under a simulated blockage load.
• Dock charging habit on these vacuums: Do not leave the vacuum sitting on the charging dock permanently. These models trickle-charge continuously when docked, which degrades cell capacity significantly faster than charging only when depleted. Charge to full, then remove from the dock.

Suction dropping before the battery indicator reaches low on the SRV 3150OR

The SRV 3150OR motor draws harder when airflow is restricted — a partially blocked filter forces it to work against back-pressure, pulling more current than the pack is rated to supply at steady state. The BMS responds by throttling output voltage to stay within safe discharge limits, and the motor slows before the indicator has a chance to catch up. The indicator reads cell voltage, not motor load, so the two diverge under restriction. Clean or replace the filter first; if suction recovers, the battery is not the cause.

Motor cuts out mid-clean then restarts after a few seconds

This is a BMS overcurrent trip, not a dead battery. When the motor is held under sustained restricted suction — tight carpet pile, a partial blockage, or a clogged filter — current draw spikes past the BMS protection threshold and the pack disconnects the output circuit. A few seconds of no load allows the BMS to reset and reconnect. The fix is to clear the restriction: remove the blockage, clean the filter, and verify airflow is unobstructed. If the motor cuts out again on a clear path, check that pack voltage at rest is above 10.0V before concluding the cell is at fault.