{"product_id":"asus-zenbook-14x-oled-ux5401ea-kn511ts-replacement-battery-1161v-5400mah-li-polymer","title":"Asus ZenBook 14X OLED Replacement Battery 11.61V 5400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAsus ZenBook 14X OLED UX5401EA Series — 11.61V Li-Polymer Replacement Battery (C31N2021)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 11.61V, 5400mAh (62.69Wh) lithium-polymer battery replaces the original cell in the Asus ZenBook 14X OLED UX5401EA-KN511TS and a wide range of ZenBook 14X and ZenBook 14 Flip OLED models. It matches OEM part numbers C31N2021 and 0B200-04030000. The cell fits the 14-inch OLED ultrabook chassis and connects through the original three-cell series configuration.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eZenBook 14X and 14 Flip OLED platform fit:\u003c\/strong\u003e\n    The UX5401EA and UN5401QA share the same 11.61V three-cell architecture, connector pinout, and BMS handshake protocol — which is why a single cell covers both the clamshell and the 360-degree flip variants without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge and discharge cycles on ZenBook 14X hardware. The BMS negotiated correctly with the EC firmware, current draw during OLED-on CPU stress registered within spec, and the protection circuit responded to both overcharge and over-discharge cutoff thresholds as expected.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-swap battery learn cycle on ZenBook BIOS:\u003c\/strong\u003e\n    After installing, run the laptop down to hibernate cutoff on battery only — no AC — then charge uninterrupted to 100%. This forces the embedded controller to relearn the new cell's capacity curve and clears the inaccurate health warning that appears in MyASUS after every cell replacement.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy BIOS reports poor battery health immediately after fitting a new cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe ZenBook's embedded controller reads health data from the battery's EEPROM — a small memory chip that stores cycle count, rated Wh, and state-of-health flags written by the original cell during manufacture. When a replacement cell arrives, those EEPROM values don't match what the EC recorded for the old pack, so it flags the battery as degraded before a single charge cycle has run. Running the full discharge-to-hibernate then uninterrupted charge sequence rewrites the learned capacity data and clears the false warning. Until that cycle completes, the health percentage shown in BIOS and MyASUS is not a reliable indicator of the new cell's condition.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eZenBook shutting down at 20–30% charge shown on screen\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the cell voltage collapses under combined CPU and OLED panel load before the fuel gauge IC expects it to — the display is showing a percentage derived from the old cell's discharge curve, not the new one. The voltage cliff hits earlier than the gauge predicts, and the EC shuts the system down to protect the cell. It is not a fault with the replacement battery. Two to three full calibration cycles — full discharge to hibernate, full charge to 100% each time — allow the fuel gauge IC to map the new cell's actual voltage-to-capacity curve and bring the shutdown point back in line with the displayed percentage.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409524392026,"sku":"BWCS-ACZ154NB-1","price":88.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409524424794,"sku":"BWCS-ACZ154NB-2","price":104.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409524457562,"sku":"BWCS-ACZ154NB-3","price":115.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ACZ154NB-1.webp?v=1779579904","url":"https:\/\/batteryweb.com\/products\/asus-zenbook-14x-oled-ux5401ea-kn511ts-replacement-battery-1161v-5400mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}