{"product_id":"machenike-f57-d4-replacement-battery-114v-4000mah-li-polymer","title":"Machenike F57-D4 Compatible Battery 11.4V 4000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMachenike F57 Series — 11.4V Li-Polymer Replacement Battery (6-87-N550S-4E41)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 11.4V 4000mAh (45.6Wh) Li-Polymer battery replaces the original cell in the Machenike F57-D4, F57-D3, F57-D5R, and F57-D2 notebooks. It matches OEM part numbers 6-87-N550S-4E41, 6-87-N550S-4E42, 6-87-N550S-4E43, and N550BAT-3. Physical dimensions are 250.40 × 85.70 × 8.20mm — verify fitment against your existing cell before installing.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eF57 platform compatibility:\u003c\/strong\u003e\n    The F57-D2 through F57-D5R share the same three-cell Li-Polymer pack with an identical voltage rail, connector pinout, and BMS handshake protocol — one SKU covers all variants without modification.\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 an F57-series board. The BMS accepted the new cell without fault codes, balanced across all three cells within two cycles, and held stable voltage under combined CPU and display load.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install calibration on the F57:\u003c\/strong\u003e\n    After fitting, run the laptop on battery until it hibernates at low-charge 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\"\u003eBIOS reporting poor battery health immediately after fitting the new cell\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe F57's BIOS reads EEPROM data embedded in the battery pack to calculate health percentage. When a new cell is installed, the EEPROM values don't yet match the charge history the BIOS expects, so it flags the pack as degraded. This is a calibration state, not a fault with the cell itself. Run one full discharge-to-hibernate cycle followed by an uninterrupted charge to 100% — the BIOS recalculates health against the new cell's actual data and the warning clears.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eF57 shutting down at 20–30% battery shown on screen\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge IC hasn't calibrated against the new cell's actual voltage curve. The IC maps a voltage reading to a percentage based on the old cell's characteristics, so it underestimates remaining charge and the laptop hits the low-voltage cutoff earlier than displayed. The cell isn't faulty — the gauge needs two to three full discharge-charge cycles to re-map correctly. After those cycles, the shutdown point should realign with the displayed percentage near 5–8%.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409564303450,"sku":"BWCS-CLN550NB-1","price":98.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409564336218,"sku":"BWCS-CLN550NB-2","price":116.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409564368986,"sku":"BWCS-CLN550NB-3","price":129.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-CLN550NB-1.webp?v=1779580013","url":"https:\/\/batteryweb.com\/products\/machenike-f57-d4-replacement-battery-114v-4000mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}