{"product_id":"asus-vivobook-a501l-replacement-battery-111v-4200mah-li-polymer","title":"Asus Vivobook A501L Replacement Battery 11.1V 4200mAh B31N1429","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAsus Vivobook A501L Series — 11.1V Li-Polymer Replacement Battery (B31N1429)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 11.1V, 4200mAh (46.62Wh) lithium-polymer battery replaces part number B31N1429 in the Asus Vivobook A501L and A501LX series. It fits the A501LX-DM023H, A501LB5200, and over 140 additional Vivobook variants sharing the same connector and voltage rail. Install it when the original cell no longer holds a useful charge or the laptop shuts down unexpectedly under load.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eA501L and A501LX platform fit:\u003c\/strong\u003e\n    These models share the same 11.1V three-cell architecture, identical 278.50 × 84.70 × 7.10 mm form factor, and a common BMS handshake over the SMBus line — so one cell covers the full range without pin remapping or firmware workarounds.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell in an A501LX chassis. The BMS initialised on first boot, the SMBus handshake completed within one POST cycle, and the charge controller accepted a full CC-CV charge to 100% without tripping the protection circuit.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install calibration on the A501L:\u003c\/strong\u003e\n    After fitting, run the battery down to hibernate-cutoff under normal use — browser, display at full brightness — then charge uninterrupted to 100%. This forces the Asus fuel gauge IC to recalibrate against the new cell and clears the false low-health flag that BIOS logs after every cell swap.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLaptop shutting down at 20–30% remaining after battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe A501L's fuel gauge IC retains charge-curve data from the old, degraded cell in its EEPROM. When a new cell is installed, the stored curve no longer matches the actual voltage profile, so the IC miscalculates the remaining capacity. Under combined CPU and display load, the cell voltage drops faster than the stale curve predicts, and the system hits the low-voltage cutoff before the displayed percentage reaches zero. One full discharge-to-hibernate followed by an uninterrupted charge to 100% rewrites the learned curve and resolves the premature shutdown.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBIOS reporting battery health as poor immediately after fitting a new cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Asus BIOS reads health status from a wear register stored in the battery's EEPROM — not from live voltage measurements. A brand-new cell ships with that register unwritten or set to factory defaults, which the BIOS interprets as a degraded or unknown state. This is a data mismatch, not a fault with the cell itself. Run two full discharge-and-charge cycles and the wear register updates to values the BIOS recognises as healthy, clearing the warning.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409739219034,"sku":"BWCS-AUA501NB-1","price":105.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409739251802,"sku":"BWCS-AUA501NB-2","price":121.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409739284570,"sku":"BWCS-AUA501NB-3","price":131.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-AUA501NB-1.webp?v=1779580582","url":"https:\/\/batteryweb.com\/products\/asus-vivobook-a501l-replacement-battery-111v-4200mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}