{"product_id":"sager-np9870-s-replacement-battery-1512v-5800mah-li-ion","title":"Sager NP9870-S Compatible Battery 15.12V 5800mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSager NP9870-S \/ NP9870 — 15.12V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 15.12V, 5800mAh (87.7Wh) Li-ion replacement battery for the Sager NP9870-S and NP9870 gaming laptops. It restores unplugged operation when the original cell has degraded or failed. Dimensions are 156.20 × 95.60 × 19.20mm — confirm clearance before ordering if your chassis has been modified.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eNP9870-S and NP9870 compatibility:\u003c\/strong\u003e\n    Both models share the same 15.12V battery rail, connector pinout, and BMS handshake protocol — one cell fits both without adapter or firmware difference.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge, discharge, and CPU-plus-display load scenarios. The BMS held voltage within spec under sustained gaming load and triggered protection cutoff correctly at the low-cell threshold.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle calibration after install:\u003c\/strong\u003e\n    After fitting this battery, run the laptop down to hibernate cutoff under normal load, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell's actual capacity and clears the inaccurate health warning that appears after every cell swap.\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 swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe NP9870's BIOS reads health data stored in the old cell's EEPROM and compares it against the new cell on first boot. The new cell has no discharge history, so the BIOS flags it as unknown or degraded. This is not a fault with the replacement cell. Run one full discharge-to-hibernate then a full uninterrupted charge — after two to three cycles the BIOS recalibrates and the health indicator returns to normal.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLaptop shuts down at 20–30% charge remaining\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge IC hasn't yet mapped the new cell's actual voltage curve. Under full CPU and display load, the system draws enough current to expose a voltage cliff that the uncalibrated gauge didn't predict — the BMS trips before the OS can respond. The fix is calibration: discharge fully to hibernate under load, not idle. After two full cycles the gauge IC tracks the new cell accurately and unexpected shutdowns stop. Confirm the cutoff voltage reads at or above 11.4V during the next discharge using your system's battery diagnostics.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409678499930,"sku":"BWCS-CLP870NB-1","price":98.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409678532698,"sku":"BWCS-CLP870NB-2","price":115.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409678565466,"sku":"BWCS-CLP870NB-3","price":128.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-CLP870NB-1.webp?v=1779580399","url":"https:\/\/batteryweb.com\/products\/sager-np9870-s-replacement-battery-1512v-5800mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}