{"product_id":"samsung-nt900x3n-k79w-replacement-battery-76v-3900mah-li-ion","title":"Samsung AA-PBTN2QT Compatible Battery 7.6V 3900mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSamsung NT900X3N Series — 7.6V Li-ion Replacement Battery (AA-PBTN2QT)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.6V, 3900mAh (29.64Wh) Li-ion replacement battery for the Samsung Series 9 ultrabook. It fits the NT900X3N-K79W and over 130 compatible NT900X3N and NT901X5N models. The cell matches the original AA-PBTN2QT specification for voltage and capacity.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eNT900X3N and NT901X5N platform fit:\u003c\/strong\u003e\n    These models share the same 7.6V battery rail, connector pinout, and BMS handshake protocol. A single cell covers the full range because Samsung held that specification consistent across the Series 9 refresh cycles.\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 communication checks on Series 9 hardware. The BMS accepted the cell, reported charge state correctly, and thermal cutoff triggered at the expected threshold — no abnormal trips recorded.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install calibration on Series 9:\u003c\/strong\u003e\n    After fitting this cell, run one full discharge down to hibernate-cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after swapping cells on these models.\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 after fitting the new cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Series 9 BIOS reads EEPROM data written by the original cell during its service life. When a new cell is fitted, the BIOS compares the fresh EEPROM against its stored health baseline and flags a mismatch as poor health. This is not a fault with the replacement cell. Run one full discharge-to-hibernate cycle followed by a full uninterrupted charge. After two to three of these calibration cycles, the BIOS health indicator updates to reflect the new cell accurately.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLaptop shuts down at 20–30% charge shown on screen\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge IC has not yet calibrated against the new cell's voltage curve. The OS reads a fuel gauge estimate that was built on the old cell's degraded profile, so it reports 25% when the cell is already near its lower voltage cliff. Under full CPU and display load, that voltage cliff arrives faster than the gauge predicts — the BMS cuts power before the OS can trigger a proper shutdown. Run two full discharge-to-100% charge cycles without interruption. After calibration, the gauge tracks the new cell correctly and the premature cutoff stops.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409665818714,"sku":"BWCS-SNT900NB-1","price":93.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409665851482,"sku":"BWCS-SNT900NB-2","price":111.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409665884250,"sku":"BWCS-SNT900NB-3","price":124.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SNT900NB-1.webp?v=1779580358","url":"https:\/\/batteryweb.com\/products\/samsung-nt900x3n-k79w-replacement-battery-76v-3900mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}