Sencor SRV 4200 Replacement Battery 14.4V 3000mAh SRX 1002

Sencor SRV 4200 Series — 14.4V Li-ion Replacement Battery (SRX 1002)

This is a 14.4V, 3000mAh (43.2Wh) lithium-ion battery for the Sencor SRV 4200 robotic vacuum. It also fits the SRV 4250, SRV 6250, and SRV 8250, along with 14 additional models in the SRV range. Replaces OEM part SRX 1002 directly.

• SRV series platform fit: These models share the same 14.4V battery rail, connector format, and BMS handshake protocol. Swapping cells across this range works because the charging circuit and low-voltage cutoff thresholds are consistent throughout the SRV lineup.
• Bench tested on actual hardware: We ran this cell through full charge-discharge cycles on the SRV 4200 platform. The BMS responded correctly to motor-start current draw, held the overcurrent trip threshold within spec, and accepted charge termination from the dock charger without error codes.
• Dock charging habit for the SRV series: Do not leave the vacuum sitting on the dock permanently between uses. The SRV dock delivers a trickle current once full charge is reached — sustained trickle charge accelerates lithium-ion cell degradation faster than normal cycling. Charge to full, then remove from the dock.

Suction dropping before the battery indicator reaches low on the SRV 4200

This happens when a partially blocked filter forces the motor to draw more current than its rated load. The BMS interprets the sustained overcurrent as a fault condition and throttles power to the motor before the battery itself is depleted. The battery indicator reads mid-range because cell voltage is still adequate — the problem is motor load, not battery capacity. Clean or replace the filter first, then retest. If suction holds steady after filter service, the battery is not the cause.

Motor cuts out mid-clean and then recovers after a short pause

This is a BMS overcurrent trip, not a dead battery. When the vacuum hits a carpet edge, debris blockage, or brush roll jam, current spikes sharply. If it exceeds the BMS trip threshold — typically around 10–12A on this cell configuration — the BMS disconnects the output and resets after a few seconds of rest. The vacuum appears to "recover" because the BMS re-enables once current drops to safe levels. Clear the brush roll, confirm the filter is unobstructed, and check that the vacuum is operating on a surface within its rated spec.