{"product_id":"silvercrest-cordless-window-vacuum-cleaner-replacement-battery-37v-3400mah-li-ion","title":"Silvercrest Cordless Window Vacuum Compatible Battery 3.7V 3400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSilvercrest SFR 3.7 D3 \/ HG004476 — 3.7V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V 3400mAh (12.58Wh) Li-ion cell replaces the original battery in the Silvercrest Cordless Window Vacuum Cleaner, covering models HG004476 and SFR 3.7 D3. The window vac draws water and suds from glass surfaces using a squeegee head and internal reservoir — no cord, no streak marks. When the original cell loses capacity, suction weakens before the indicator even reaches low.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eHG004476 and SFR 3.7 D3 compatibility:\u003c\/strong\u003e\n    Both models run the same 3.7V single-cell architecture with an identical BMS handshake and connector footprint. The cell dimensions — 66.32 × 20.20 × 18.40mm — match the original cavity precisely, so no modifications are needed during swap.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge and discharge cycles on the SFR 3.7 D3 platform. The BMS accepted the replacement without error flags, and the motor drew cleanly within rated current throughout each cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eDock charging discipline for this device:\u003c\/strong\u003e\n    The Silvercrest window vac has no active charge termination beyond the BMS. Leaving it on the charging cradle after a full charge trickle-damages the cell over weeks. Charge to full, remove from the dock, and reconnect only when the battery is depleted.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSuction dropping before the battery indicator reaches low\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe SFR 3.7 D3 motor voltage sags under load before the cell voltage drops far enough to trigger the low-battery LED. A partially blocked filter or full reservoir forces the motor to draw more current than rated, accelerating that sag. The result is noticeably weaker suction while the indicator still shows charge remaining. Clear the filter and empty the reservoir first — if suction then recovers, the cell is likely fine. If sag persists on a clean filter, the cell has lost capacity and resting voltage will measure below 3.5V.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eMotor cuts out mid-clean then restarts after a few seconds\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a BMS overcurrent trip, not a motor fault. When airflow is restricted — blocked filter, overfull reservoir, or pressed too hard against the glass — current draw spikes and the BMS cuts the circuit to protect the cell. The brief pause lets the BMS reset, then power returns. Fix the restriction first: clear the filter and check the reservoir. If cut-outs continue on a clean, empty device, charge the battery fully and confirm resting voltage holds above 3.6V before ruling the cell out.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43428032217178,"sku":"BWCS-LDC511VX-1","price":28.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43428032249946,"sku":"BWCS-LDC511VX-2","price":32.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43428032282714,"sku":"BWCS-LDC511VX-3","price":35.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LDC511VX-1.webp?v=1779933917","url":"https:\/\/batteryweb.com\/products\/silvercrest-cordless-window-vacuum-cleaner-replacement-battery-37v-3400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}