{"product_id":"samsung-galaxy-s10-5g-replacement-battery-385v-4000mah-li-polymer","title":"Samsung Galaxy S10 5G EB-BG977ABU Replacement Battery 3.85V 4000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSamsung Galaxy S10 5G — 3.85V Li-Polymer Replacement Battery (EB-BG977ABU)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.85V, 4000mAh Li-Polymer battery replaces part number EB-BG977ABU in the Samsung Galaxy S10 5G. It fits the SM-G977 series, including SM-G977V and SM-G977U variants. Swap it in when the original cell no longer holds a charge or shuts down unexpectedly under load.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSM-G977 series compatibility:\u003c\/strong\u003e\n    All SM-G977 variants share the same physical cell pocket, connector pinout, and BMS handshake protocol. The voltage rail runs at 3.85V nominal, and the charge IC expects a lithium-polymer cell with matched impedance — this cell meets both requirements.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through a full charge-discharge cycle on an SM-G977V. The BMS accepted the cell without error flags, the charge IC stepped through trickle, CC, and CV phases cleanly, and coulomb counter registration completed after one full cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration after installation:\u003c\/strong\u003e\n    On first use, disable fast charging and run one complete discharge-charge cycle at standard rate. This lets the fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before high-current charging pushes current into an uncalibrated reference table.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\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 because the fuel gauge IC still references the old cell's discharge curve. When the S10 5G hits a peak load — 5G modem handoff, sustained screen brightness, or GPS — the new cell's voltage drops faster than the old curve predicts. The phone reads 25% but the cell voltage has already fallen below the BMS protection threshold. Run one full discharge to 1% under normal use, then charge to 100% without interruption, and the coulomb counter re-anchors to the new curve.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUSB-PD fast charge not activating after the cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAfter a cell replacement, the charge IC on the S10 5G sometimes defaults to standard 5V input and won't negotiate USB-PD fast charge on the first cycle. This is a handshake timing issue between the new BMS and the device's charge controller — not a cable or charger fault. Power the phone fully off, connect the original Samsung fast charger, then power back on. If fast charge still doesn't activate, complete one standard-rate charge cycle first, then retry.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391999574106,"sku":"BWCS-SMG977XL-1","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391999606874,"sku":"BWCS-SMG977XL-2","price":28.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391999639642,"sku":"BWCS-SMG977XL-3","price":31.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SMG977XL-1.webp?v=1779142875","url":"https:\/\/batteryweb.com\/products\/samsung-galaxy-s10-5g-replacement-battery-385v-4000mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}