{"product_id":"samsung-galaxy-a21s-2020-replacement-battery-385v-4900mah-li-polymer","title":"Samsung Galaxy A21s EB-BA217ABY Replacement Battery 3.85V 4900mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSamsung Galaxy A21s 2020 — 3.85V Li-Polymer Replacement Battery (EB-BA217ABY)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.85V, 4900mAh Li-Polymer replacement battery for the Samsung Galaxy A21s 2020, covering SM-A217F, SM-A217F\/DSN, and SM-A217F\/DS variants. It matches OEM part numbers EB-BA217ABY and GH82-22989A. Fit this cell when the original 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-A217F variant coverage:\u003c\/strong\u003e\n    The SM-A217F, SM-A217F\/DSN, and SM-A217F\/DS all run the same 3.85V battery rail, share the same connector pinout, and use the same BMS handshake — one cell fits all listed variants without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on the SM-A217F platform and confirmed the BMS accepted the cell, charge termination triggered correctly at full capacity, and no protection trip occurred during standard load draws.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    On first use after installation, disable fast charging and run one full 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 begins on an uncalibrated cell.\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 Galaxy A21s after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Galaxy A21s uses a coulomb-counter fuel gauge that was calibrated to the old cell's discharge curve. When a new cell goes in, the gauge still references the old curve, and it misjudges the voltage cliff — the point where cell voltage drops sharply under modem or screen load. The phone reads 25% but the actual open-circuit voltage is already near the BMS low-voltage cutoff. One full slow discharge cycle from 100% to auto-shutdown, followed by a full charge, forces the fuel gauge IC to re-anchor its reference points to the new cell.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUSB fast charge not activating on the first cycle after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eSamsung's Adaptive Fast Charging handshake requires the BMS to confirm cell state before the charge IC ramps up current. On a freshly installed cell with no cycle history, the BMS may reject the elevated current request and default to standard 5V\/1A charging on the first session. This is not a fault in the adapter or the cable. Charge the phone fully at standard rate once, then unplug and replug — the BMS will have logged one complete cycle and will accept the fast charge protocol on subsequent sessions.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391948456026,"sku":"BWCS-SMA217SL-1","price":30.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391948488794,"sku":"BWCS-SMA217SL-2","price":34.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391948521562,"sku":"BWCS-SMA217SL-3","price":37.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SMA217SL-1.webp?v=1779142720","url":"https:\/\/batteryweb.com\/products\/samsung-galaxy-a21s-2020-replacement-battery-385v-4900mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}