{"product_id":"samsung-galaxy-s8-active-replacement-battery-385v-3900mah-li-polymer","title":"Samsung Galaxy S8 Active EB-BG892ABA Replacement Battery 3.85V 3900mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSamsung Galaxy S8 Active — 3.85V Li-Polymer Replacement Battery (EB-BG892ABA)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.85V, 3900mAh Li-Polymer replacement battery for the Samsung Galaxy S8 Active smartphone. It fits SM-G892A and SM-G892U units, including the TD-LTE variant. Capacity is 3900mAh — identical to the OEM specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSM-G892A and SM-G892U compatibility:\u003c\/strong\u003e\n    Both variants share the same battery bay geometry, connector pinout, and BMS handshake protocol. The EB-BG892ABA cell works across all three S8 Active model numbers 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 full charge and discharge cycles on an SM-G892A unit. The BMS accepted the charge IC handshake on the first cycle, and protection circuits tripped correctly at low-voltage cutoff — no false overcurrent events during testing.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration after swap:\u003c\/strong\u003e\n    On first use after installation, disable fast charging and run one complete discharge-charge cycle at standard rate. This lets the fuel gauge IC map the new cell's discharge curve before the coulomb counter locks in its reference points.\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 S8 Active after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage cliff problem, not a capacity problem. A fresh Li-Polymer cell has a slightly different voltage-to-capacity curve than the aged cell the fuel gauge IC was calibrated against. When the modem fires at full power or the screen peaks brightness, the phone pulls a current spike the uncalibrated gauge cannot predict — voltage drops below the safe floor and the BMS cuts power before the reported percentage reaches zero. One full discharge-charge cycle at standard rate resets the coulomb counter against the new curve. After that, shutdowns at 20–30% typically stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUSB fast charge not activating after battery replacement\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe S8 Active's charge IC uses a handshake sequence on the first cycle to verify BMS parameters before enabling Adaptive Fast Charging. On a new cell, that handshake sometimes stalls — the charger falls back to standard 5V\/1A and never steps up. To clear it, charge the phone to 100% via a standard charger, then power cycle the device completely. On the next charge session, reconnect the Adaptive Fast Charger — the BMS should complete the handshake and allow the voltage step-up to 9V.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391943606362,"sku":"BWCS-SMG892SL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391943639130,"sku":"BWCS-SMG892SL-2","price":29.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391943671898,"sku":"BWCS-SMG892SL-3","price":32.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SMG892SL-1.webp?v=1779142694","url":"https:\/\/batteryweb.com\/products\/samsung-galaxy-s8-active-replacement-battery-385v-3900mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}