{"product_id":"asus-q501l-replacement-battery-148v-4500mah-li-polymer","title":"C41-N541 Asus Q501L Replacement Battery 14.8V 4500mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAsus Q501L Series — 14.8V Li-Polymer Replacement Battery (C41-N541)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 14.8V, 4500mAh (66.6Wh) lithium-polymer battery replaces the original C41-N541 cell in the Asus Q501L notebook series. It fits the Q501L, Q501LA, Q501LA-BBI5T03, and Q501LA-BSI5T19. The four-cell Li-Polymer pack slots into the same bay as the factory unit with no modification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eQ501L and Q501LA compatibility:\u003c\/strong\u003e\n    All four Q501L variants share the same 14.8V power rail, C41-N541 connector pinout, and BMS handshake protocol — which is why one cell covers the full model range without firmware differences.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through full charge and discharge cycles on a Q501LA unit. The BMS negotiated correctly, protection circuits tripped at expected low-voltage thresholds, and the charge controller accepted the cell without fault codes.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle calibration on the Q501L:\u003c\/strong\u003e\n    After installing, run the laptop down to hibernate-cutoff on battery only, then charge uninterrupted to 100%. This forces the Q501L's fuel gauge IC to re-learn the new cell's capacity curve and clears the inaccurate health warning the BIOS throws 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\"\u003eBIOS reporting poor battery health immediately after fitting a new C41-N541\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Q501L BIOS reads health data stored in the battery's EEPROM and compares it against a learned baseline from the previous cell. A brand-new cell has a blank or mismatched EEPROM record, so the BIOS flags it as degraded before any cycling has occurred. This is not a fault with the replacement cell. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% overwrites the stored baseline and clears the warning. If the warning persists after two full cycles, check BIOS version — some Q501L firmware revisions require an update before they accept third-party cell EEPROM data correctly.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eQ501LA shutting down at 20–30% charge shown on screen\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge IC still holds calibration data from a degraded old cell and maps the new cell's voltage curve incorrectly. Under full CPU and display load, the actual cell voltage drops faster than the gauge predicts — the laptop hits the hardware low-voltage cutoff while the OS still shows 20–30% remaining. The fix is two or three complete discharge-to-hibernate and full-recharge cycles so the fuel gauge IC recalibrates against the new cell's actual voltage curve. After calibration, the reported percentage and the real cutoff point will align — target a resting voltage of around 16.4V at a full charge state for this four-cell pack.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409772544090,"sku":"BWCS-AUQ501NB-1","price":139.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409772576858,"sku":"BWCS-AUQ501NB-2","price":160.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409772609626,"sku":"BWCS-AUQ501NB-3","price":176.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-AUQ501NB-1.webp?v=1779580772","url":"https:\/\/batteryweb.com\/products\/asus-q501l-replacement-battery-148v-4500mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}