{"product_id":"msi-megabook-s271-replacement-battery-144v-4400mah-li-ion","title":"MSI MegaBook S271 Replacement Battery 14.4V 4400mAh 0299-MP1006J443","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMSI MegaBook S271 — 14.4V Li-ion Replacement Battery (BTY-S27)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 14.4V, 4400mAh (63.36Wh) Li-ion battery pack for the MSI MegaBook S270, S271, S262, and S260 series notebooks. It replaces OEM part numbers including BTY-S25, BTY-S27, BTY-S28, and 0299-MP1006J443, among others. If your original cell no longer holds charge through a normal session, this swap restores full capacity to the same voltage rail the laptop expects.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMegaBook S260–S271 series fit:\u003c\/strong\u003e\n    These models share the same connector pinout, 14.4V rail, and BMS handshake protocol across the S260, S262, S270, and S271 variants. The cell communicates charge state to the EC via the same SMBus lines, so the pack seats and registers without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack through charge and discharge cycles on the MegaBook platform and confirmed the BMS engaged charge termination correctly at full capacity, with no overcharge events or premature cutoff under sustained CPU and display load.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install calibration on MSI notebooks:\u003c\/strong\u003e\n    After fitting this cell, run the laptop down until it hibernates on its own, then charge uninterrupted to 100% without waking it. This forces the BIOS battery learn cycle to reset against the new cell's actual capacity and clears the false \"battery health poor\" flag 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 battery health as poor after fitting a new cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eMSI MegaBook firmware stores learned capacity data from the previous cell in the EC's EEPROM. When a new cell goes in, the BIOS compares live readings against stale data and flags a health warning immediately. This is not a fault with the replacement pack — it is a calibration mismatch. Run one full discharge to hibernate cutoff, then charge without interruption to 100%. After that cycle, the BIOS re-learns the cell and the health warning clears.\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 has not yet calibrated against the new cell's discharge curve. The gauge reads a state-of-charge percentage that does not match the actual cell voltage — when the real cell voltage drops below the EC's cutoff threshold, the system shuts down even though the OS shows charge remaining. It is not a fault in the replacement pack. Complete two to three full discharge-to-hibernate and full-charge cycles, and the fuel gauge IC will map the new cell's curve accurately. After calibration, shutdown should not occur above 5% displayed charge.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409815175258,"sku":"BWCS-MSX320NP-1","price":122.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409815208026,"sku":"BWCS-MSX320NP-2","price":140.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409815240794,"sku":"BWCS-MSX320NP-3","price":153.99,"currency_code":"USD","in_stock":true}],"url":"https:\/\/batteryweb.com\/products\/msi-megabook-s271-replacement-battery-144v-4400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}