{"product_id":"sony-vaio-vgn-aw41jf-replacement-battery-111v-4400mah-li-ion","title":"Sony VAIO VGN-AW41JF Compatible Battery 11.1V 4400mAh VGP-BPS21","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSony VAIO VGN-AW41JF Series — 11.1V Li-ion Replacement Battery (VGP-BPS21)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is an 11.1V, 4400mAh (48.84Wh) lithium-ion battery for the Sony VAIO VGN-AW41JF and related AW-series notebooks. It replaces OEM part numbers VGP-BPS21, VGP-BPS21A, VGP-BPS21B, and VGP-BP21A. The battery restores cordless operation on systems where the original cell no longer holds a usable charge.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAW-series compatibility:\u003c\/strong\u003e\n    The VGN-AW41JF, AW41MF, AW41XH, AW41ZF, and hundreds of related AW-series models share the same 11.1V three-cell rail, connector pinout, and BMS handshake protocol. Any unit accepting VGP-BPS21, VGP-BPS21A, or VGP-BPS21B will accept this cell.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this battery on a VGN-AW series unit and confirmed the BMS completed handshake on first boot, VAIO Control Center registered the cell, and the charge circuit accepted a full charge cycle without interruption.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle discharge procedure:\u003c\/strong\u003e\n    After fitting this cell, run the laptop on battery until it hibernates at cutoff — do not interrupt. Then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health or \"replace battery\" warning that appears after most cell swaps on VAIO hardware.\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\"\u003eSony VAIO notebooks store charge history and health data in EEPROM on the battery itself. When a new cell arrives, the BIOS reads that EEPROM data — which is blank or pre-set — and flags the battery as degraded or unknown. This is a firmware interpretation issue, not a fault with the replacement cell. Running one complete discharge-to-hibernate followed by an uninterrupted charge to 100% gives the BIOS the data it needs to re-evaluate health status accurately. After two to three cycles, the health indicator should resolve to normal.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLaptop shuts off abruptly at 20–30% charge shown on the gauge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge IC is still calibrated to the old, degraded cell's discharge curve. The gauge reports 20–30% remaining, but the new cell's actual voltage under combined CPU and display load drops past the BMS cutoff threshold before the percentage reaches zero. The system shuts down because the BMS is protecting the cell, not because the gauge is correct. Run two full discharge-to-hibernate and charge-to-100% cycles — by the second cycle, the fuel gauge IC recalibrates to the new cell's curve and cutoffs align with the displayed percentage.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43411617316954,"sku":"BWCS-BPS21NB-1","price":81.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43411617349722,"sku":"BWCS-BPS21NB-2","price":96.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43411617382490,"sku":"BWCS-BPS21NB-3","price":107.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BPS21NB-1.webp?v=1779581142","url":"https:\/\/batteryweb.com\/products\/sony-vaio-vgn-aw41jf-replacement-battery-111v-4400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}