{"product_id":"asus-e1504fa-bq038w-replacement-battery-1155v-3600mah-li-polymer","title":"Asus VivoBook 15 E1504FA Replacement Battery 11.55V 3600mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAsus E1504FA Series — 11.55V Li-Polymer Replacement Battery (0B200-04260000)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 11.55V, 3600mAh (41.58Wh) Li-Polymer battery replaces the original cell in the Asus VivoBook 15 E1504FA series, including the BQ038W, BQ090, BQ204W, BQ372W, and over 260 additional variants. It matches OEM part numbers 0B200-04260000 and C31N2201. The connector, BMS handshake protocol, and physical dimensions are a direct match for the E1504FA platform.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eE1504FA platform compatibility:\u003c\/strong\u003e\n    All E1504FA variants share the same 11.55V three-cell configuration, connector pinout, and BMS communication line. That common architecture means one cell fits the full production run without adapter modifications 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 through charge, discharge, and BMS handshake verification on E1504FA hardware. The BMS negotiated correctly, charge current stepped down at the expected threshold, and no fault codes were triggered during the cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBIOS learn cycle after install:\u003c\/strong\u003e\n    After fitting this cell, run the laptop down to hibernate-level cutoff on battery power, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after any cell swap on the E1504FA platform.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBIOS reporting battery health as poor immediately after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe E1504FA stores capacity and cycle-count data in the EEPROM of the battery's fuel gauge IC. When a new cell is installed, the BIOS reads stale EEPROM values that do not match the fresh chemistry, and flags the battery as degraded. This is a data mismatch, not a cell fault. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% allows the fuel gauge IC to write fresh calibration data. After two to three cycles, the health status normalises in both BIOS and Windows battery report.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eVivoBook 15 shutting down at 20–30% charge shown\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis symptom appears when the fuel gauge IC has not yet calibrated against the new cell's actual discharge curve. The displayed percentage no longer matches the real cell voltage, so the laptop hits the low-voltage cutoff while the gauge still reads 20–30%. The fix is the same learn cycle: discharge fully to hibernate, then charge to 100% without interruption. After the calibration cycle, the shutdown threshold should align with the gauge reading at or below 5% remaining — approximately 10.5V at the cell terminals under light load.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409643339866,"sku":"BWCS-ACV150NB-1","price":83.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409643372634,"sku":"BWCS-ACV150NB-2","price":99.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409643405402,"sku":"BWCS-ACV150NB-3","price":110.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ACV150NB-1.webp?v=1779579903","url":"https:\/\/batteryweb.com\/products\/asus-e1504fa-bq038w-replacement-battery-1155v-3600mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}