Silvercrest 3.2V Cordless Window Vacuum Compatible Battery 1400mAh

Silvercrest Cordless Window Vacuum Cleaner (SFR 3.7 D3 / HG004476) — 3.2V LiFePO4 Replacement Battery

This is a 3.2V 1400mAh LiFePO4 replacement battery for the Silvercrest Cordless Window Vacuum Cleaner. It fits models referenced under HG004476 and SFR 3.7 D3. When the original cell degrades and suction weakens or charge no longer holds, this cell restores full motor voltage to the unit.

• SFR 3.7 D3 and HG004476 compatibility: These models share the same 3.2V single-cell LiFePO4 configuration, same physical cell dimensions (67.10 × 20.00 × 18.70mm), and the same BMS handshake requirements. One cell fits both.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the CS-LDC510VX platform. The BMS accepted the cell without fault flags, and motor draw remained stable across the full discharge curve without triggering overcurrent cutoff.
• Dock charging on the CS-LDC510VX: Do not leave this vacuum sitting on the charging dock permanently. Continuous trickle charge accelerates capacity fade in LiFePO4 cells at this capacity class. Charge to full, then remove from the dock.

Suction dropping before the battery indicator shows low on the SFR 3.7 D3

The CS-LDC510VX motor draws more current when the filter is partially blocked or when squeegee channels are restricted with debris. That increased draw causes voltage to sag at the cell terminals before the indicator circuit registers a low-battery state. The result is noticeably weaker suction while the LED still shows charge remaining. Clean the filter and check the squeegee channel first — if suction restores immediately, the cell is fine and the issue is restriction, not battery capacity.

Motor cuts out mid-use and then recovers after a few seconds

This is a BMS overcurrent trip, not a flat battery. When the motor sustains a high-draw condition — blocked airpath, clogged filter, or debris lodged in the suction head — current spikes past the BMS threshold and it disconnects the cell to protect it. After a few seconds the BMS resets and power returns. Clear the blockage completely before restarting. If the cutout happens repeatedly on a clean filter with a new cell, measure resting cell voltage — it should read 3.2–3.3V at full charge on a LiFePO4 cell.