Sencor SRV 9550BK Replacement Battery 14.8V 6700mAh

Sencor SRV 9550BK — 14.8V Li-ion Replacement Battery (SRX 0507)

This is a 14.8V 6700mAh Li-ion replacement battery for the Sencor SRV 9550BK robotic vacuum cleaner. It matches the OEM part number SRX 0507 and fits the original battery bay directly. Capacity is 6700mAh — use the product data figure, not third-party estimates.

• SRV 9550BK platform fit: The SRV 9550BK runs a 14.8V four-cell Li-ion pack with a BMS that monitors cell balance and communicates a ready state to the dock charger. This replacement matches that voltage rail and BMS handshake profile, so the dock recognises the pack and initiates a proper charge cycle.
• Bench tested on actual hardware: We cycled this pack through full charge and discharge on the SRV 9550BK platform and confirmed BMS wake, dock handshake, and cell balance behaviour. The protection circuit tripped correctly at low-cell threshold and recovered on reconnect to the dock.
• Dock charging habit for the SRV 9550BK: Do not leave the robot sitting on the dock permanently between cleans. Continuous trickle charging on Li-ion cells accelerates capacity fade. Charge to full, let the dock indicator confirm completion, then remove the vacuum or at minimum run a cleaning cycle before returning it to dock.

Suction dropping before the battery indicator reaches low on the SRV 9550BK

The SRV 9550BK motor draws significantly more current when airflow is restricted — a partially blocked filter or full dustbin forces the motor to work harder, pulling the cell voltage down faster than the indicator circuit expects. The BMS reads this as normal load but the motor loses effective power well before the low-battery threshold triggers. The indicator is calibrated for a clean, unobstructed motor draw. Clean the filter and empty the dustbin, then rerun the vacuum — if suction recovers immediately, the battery is not the cause.

Motor cutting out mid-cycle and then recovering after a few seconds

This is a BMS overcurrent trip, not a dead battery. When the SRV 9550BK drives over heavy carpet or catches a blockage, the motor current spikes sharply. If the spike exceeds the BMS overcurrent threshold — typically around 10–12A on this class of pack — the protection circuit opens the discharge path and the motor stops. The BMS resets automatically after a few seconds once current demand drops to zero. The fix is to clear the blockage or check whether the brush roll is tangled, then verify the BMS recovers by powering the unit on again.