{"product_id":"msi-wind-90-replacement-battery-111v-4400mah-li-ion","title":"BTY-S11 MSI Wind 90 Replacement Battery 11.1V 4400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMSI Wind U100 Series — 11.1V Li-ion Replacement Battery (BTY-S11)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 11.1V, 4400mAh Li-ion replacement battery for the MSI Wind 90 and Wind U100 series netbooks. It slots into the underside battery bay and powers the unit during mobile use. Capacity is 48.84Wh — matched to the original cell specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eWind 90 and U100 platform fit:\u003c\/strong\u003e\n    Both the Wind 90 and Wind U100 variants share the same battery bay geometry, connector pinout, and BMS handshake protocol. The BTY-S11 part number covers the full spread of Wind U100 regional SKUs — including the 002LA and 035US editions — because MSI used the same battery controller board across the lineup.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell on a Wind U100 unit and confirmed the BMS completed a full charge handshake without error codes. Voltage held stable at 11.1V nominal across load, and the charge controller accepted the cell without fault flags.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install recalibration on Wind netbooks:\u003c\/strong\u003e\n    After fitting this cell, run one full discharge down to the automatic hibernate cutoff, then charge uninterrupted to 100%. The Wind U100 BIOS uses a battery learn cycle — skipping this step leaves the fuel gauge reading a corrupted baseline from the old cell, causing the health warning on the battery status page.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBIOS reporting poor battery health immediately after fitting a new cell\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Wind U100 BIOS stores battery health data in EEPROM tied to the old cell's charge history. When a new cell goes in, that stored data does not clear automatically — the BIOS reads the new cell against stale parameters and flags it as degraded. This is not a fault with the replacement battery. Running one complete discharge-to-hibernate followed by an uninterrupted full charge forces the BIOS to rewrite the learn cycle against the new cell's actual capacity. After that cycle, the health status clears and the fuel gauge reads accurately.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eNetbook shutting down abruptly at 20–30% charge shown on screen\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the cell voltage drops below the BMS cutoff threshold under simultaneous CPU and display load before the fuel gauge predicts it will. It is a calibration gap — not a defective cell. The fuel gauge IC has not yet mapped the new cell's actual voltage-to-capacity curve, so it allows the system to run into the voltage cliff. Run two full discharge-to-hibernate and full recharge cycles back-to-back. After the second cycle, the gauge IC recalibrates against real discharge data and the early shutdowns stop. Confirm the BIOS battery info shows a non-zero Wh value after calibration — target 48Wh or above.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43410825904218,"sku":"BWCS-MSU100HB-1","price":93.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43410825936986,"sku":"BWCS-MSU100HB-2","price":106.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43410825969754,"sku":"BWCS-MSU100HB-3","price":116.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MSU100HB-1.webp?v=1779581287","url":"https:\/\/batteryweb.com\/products\/msi-wind-90-replacement-battery-111v-4400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}