{"product_id":"uniwill-n243-replacement-battery-148v-4400mah-li-ion","title":"Uniwill N243 Compatible Battery 14.8V 4400mAh 23-U74201-31","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eUniwill N243 \/ N244 — 14.8V Li-ion Replacement Battery (23-U74201-31)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 14.8V Li-ion battery replaces the original pack in Uniwill N243 and N244 notebook computers. It carries 4400mAh (65.12Wh) — matched to the original Uniwill specification. OEM part numbers covered include 23-U74201-31, 23-U74204-00, 23-UD3202-00, BAT-243S1, and the full UN243 series variants.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eN243 and N244 platform fit:\u003c\/strong\u003e\n    Both models share the same 14.8V four-cell battery rail, connector pinout, and BMS handshake protocol — one pack covers both. The part numbers 243-4S4400-S2M1 and UN243S8-P confirm shared electrical architecture across the N243 and N244 chassis.\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 the N243 platform. The BMS handshake completed without fault flags, charge termination triggered correctly at full capacity, and the protection circuit responded to over-discharge cutoff at the expected voltage threshold.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install calibration on the N243:\u003c\/strong\u003e\n    After fitting this battery, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after a cell swap — skipping this step leaves the fuel gauge IC calibrated against old cell data.\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\"\u003eThe N243 BIOS reads health data from EEPROM embedded in the battery pack — not from live voltage. When a replacement cell arrives, that EEPROM contains new or reset data that does not match the learned profile stored in the system firmware. The BIOS interprets the mismatch as a degraded or unknown pack and flags it accordingly. Running one complete discharge-to-hibernate then a full uninterrupted charge forces the BIOS to rewrite its learned profile against the new cell chemistry and clears the warning.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eN243 shutting down abruptly at 20–30% shown on the gauge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage cliff issue — under combined CPU and display load, cell voltage drops faster than the fuel gauge IC can recalculate state-of-charge. The system sees voltage fall below the BMS cutoff threshold before the displayed percentage reaches zero. It is most common when the fuel gauge IC has not yet run calibration cycles against the new cell. Complete two full discharge-to-hibernate and charge-to-100% cycles; after the second cycle the gauge IC recalibrates its discharge curve and the cutoff should align with a displayed level below 10%.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43410843697242,"sku":"BWCS-UWN243NB-1","price":81.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43410843730010,"sku":"BWCS-UWN243NB-2","price":95.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43410843762778,"sku":"BWCS-UWN243NB-3","price":106.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-UWN243NB-1.webp?v=1779581321","url":"https:\/\/batteryweb.com\/products\/uniwill-n243-replacement-battery-148v-4400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}