{"product_id":"samsung-np-x280-replacement-battery-74v-3800mah-li-ion","title":"Samsung NP-X280 Notebook Replacement Battery 7.4V 3800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSamsung NP-X280 \/ NT-X280 Series — 7.4V Li-ion Replacement Battery (AA-PB3VC4B)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V, 3800mAh (28.12Wh) Li-ion battery for the Samsung NP-X280, NT-X280, NT-X181, and NT-X180 notebook series. It slots into the same bay as the original AA-PB3VC4B and AA-PB3VC4E cells. Install it when the original pack no longer holds a charge or the laptop only runs on wall power.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eNP-X280 and NT-X series compatibility:\u003c\/strong\u003e\n    These models share the same 7.4V two-cell rail, identical connector pinout, and the same BMS handshake protocol — which is why one pack covers all four variants. The BMS reads cell voltage on pins 3 and 4; a mismatch here causes the laptop to reject the pack entirely.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell on the NP-X280 platform and logged the BMS charge cycle from 0V recovery through CC\/CV cutoff. The protection circuit held charge termination at 8.4V and did not trigger overcurrent cutoff during a full CPU stress load cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle calibration on the X280:\u003c\/strong\u003e\n    After installing, 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 every cell swap on this platform.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the NP-X280 BIOS reports poor battery health after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe X280 BIOS reads health data stored in the old pack's EEPROM and compares it against the new cell's voltage signature. A fresh cell has a different charge curve than a degraded original, so the BIOS flags it as faulted on first boot. This is not a defect in the replacement cell. Run one full discharge-to-hibernate cycle followed by an uninterrupted charge to 100%, and the BIOS recalibrates its learn cycle against the new chemistry. After two to three full cycles, the health indicator corrects itself.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLaptop 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 is still calibrated to the old cell's discharge curve. The gauge reads 25% remaining, but the actual cell voltage has already dropped below the load threshold the CPU and display draw together — the laptop hits a voltage cliff and shuts off without warning. The fix is a full calibration cycle: let the laptop drain completely to hibernate-cutoff under normal use load, then charge to 100% without interruption. After two full cycles the gauge IC re-maps to the new cell and shutdown at false percentages stops. Target full charge endpoint is 8.4V across the pack.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409661493338,"sku":"BWCS-SMX280NB-1","price":47.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409661526106,"sku":"BWCS-SMX280NB-2","price":55.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409661558874,"sku":"BWCS-SMX280NB-3","price":61.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SMX280NB-1.webp?v=1779580359","url":"https:\/\/batteryweb.com\/products\/samsung-np-x280-replacement-battery-74v-3800mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}