{"product_id":"vileda-windomatic-fenstersauger-replacement-battery-37v-2900mah-li-ion","title":"Vileda Windomatic 3.7V Replacement Battery Li-ion 2900mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eVileda Windomatic Window Vacuum Cleaner — 3.7V Li-ion Replacement Battery\u003c\/h2\u003e\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 2900mAh lithium-ion cell replaces the internal battery in the Vileda Windomatic Fenstersauger cordless window vacuum. The Windomatic runs on a single-cell Li-ion pack at 3.7V nominal — a compact format that keeps the unit under 640 grams. Matching voltage and capacity matters here because the device's onboard charging circuit is calibrated to this cell specification.\u003c\/p\u003e\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eWindomatic Fenstersauger compatibility:\u003c\/strong\u003e The Windomatic uses a slim 3.7V single-cell pack at 66.65 x 19.50 x 18.50mm — this cell matches that voltage rail, physical footprint, and connector orientation exactly.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e We ran full charge\/discharge cycles — the BMS held voltage steady under suction load and cut off cleanly at the low-voltage threshold without triggering false shutdowns.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFirst charge before use:\u003c\/strong\u003e With Li-ion cells that have been in storage, run a full charge cycle before the first use to let the BMS calibrate its state-of-charge reference correctly.\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \u003chr class=\"bpw-desc-divider\"\u003e\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy cell dimensions matter in the Windomatic's battery bay\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Windomatic's lightweight chassis leaves almost no tolerance around the battery compartment. A cell even a millimetre oversized can crack the housing or prevent the contacts from seating. At 66.65 x 19.50 x 18.50mm, this replacement matches the OEM footprint. No forcing, no padding required.\u003c\/p\u003e\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWindomatic turns on but suction drops almost immediately — here's why\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis usually means the cell's internal resistance has climbed high enough that voltage sags under motor load, triggering the BMS low-voltage cutoff prematurely. It's a sign the original cell has aged past useful capacity — not a motor fault. Swapping the cell resolves it. If the symptom returns quickly on a new cell, check that the charging contacts are clean and making full contact.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43175821672538,"sku":"BWCS-WGF300VX-1","price":30.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43175821705306,"sku":"BWCS-WGF300VX-2","price":34.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43175821738074,"sku":"BWCS-WGF300VX-3","price":38.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-WGF300VX-1.webp?v=1775236276","url":"https:\/\/batteryweb.com\/products\/vileda-windomatic-fenstersauger-replacement-battery-37v-2900mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}