{"product_id":"samsung-fold-replacement-battery-385v-2000mah-li-polymer","title":"Samsung Galaxy Fold EB-BF901ABU Replacement Battery 3.85V 2000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSamsung Galaxy Fold — 3.85V Li-Polymer Replacement Battery (EB-BF901ABU)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.85V, 2000mAh Li-Polymer cell that replaces the internal battery in the Samsung Galaxy Fold. It fits the SM-F900J, SM-F9000, SM-F900F, and related SM-F900 variants. Install it when the original cell no longer holds a charge or causes unexpected shutdowns.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSM-F900 series compatibility:\u003c\/strong\u003e\n    All SM-F900 variants share the same voltage rail, connector pinout, and BMS handshake protocol as the original EB-BF901ABU cell. The fuel gauge IC communicates over the same I2C bus, so the replacement cell pairs without firmware rejection.\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 SM-F9000 unit. The BMS accepted the cell immediately, charge current ramped correctly through CC\/CV stages, and the protection circuit triggered at expected cutoff thresholds without false trips.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle calibration tip:\u003c\/strong\u003e\n    On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate its coulomb counter against the new cell's actual discharge curve before high-current charging pushes amps into an uncalibrated state.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Fold reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Galaxy Fold uses a fuel gauge IC that tracks charge state using a learned discharge curve from the old cell. After installing a new cell, that stored curve no longer matches the new cell's characteristics. The IC's coulomb counter starts reporting inaccurate state-of-charge figures — often reading higher than actual. One full slow discharge down to shutdown, followed by a complete uninterrupted charge to 100%, resets the learned curve and restores accurate percentage readings.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the new cell's voltage drops below the minimum threshold the modem or foldable display controller will tolerate under peak load — even though the fuel gauge still reads 20–30%. The cell voltage sags sharply during high-draw moments, hitting the BMS undervoltage cutoff at roughly 3.0V per cell before the percentage reaches zero. It is not a faulty battery — it is an uncalibrated fuel gauge reading a flat discharge curve instead of the actual voltage. Run one full slow discharge-charge cycle to recalibrate; shutdowns at low percentage should stop after that.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391817121882,"sku":"BWCS-SMF900SL-1","price":38.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391817154650,"sku":"BWCS-SMF900SL-2","price":45.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391817187418,"sku":"BWCS-SMF900SL-3","price":49.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SMF900SL-1.webp?v=1779142239","url":"https:\/\/batteryweb.com\/products\/samsung-fold-replacement-battery-385v-2000mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}