{"product_id":"samsung-galaxy-m20-replacement-battery-385v-4900mah-li-polymer","title":"Samsung Galaxy M20 EB-BG580ABU Replacement Battery 3.85V 4900mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSamsung Galaxy M20 \/ SM-M205 — 3.85V Li-Polymer Replacement Battery (EB-BG580ABU)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.85V, 4900mAh Li-Polymer battery for the Samsung Galaxy M20 and SM-M205 series smartphones, including SM-M205F\/DS and M20 Duos variants. It replaces OEM part EB-BG580ABU and GH82-18701A. If the original cell is swelling, draining faster than expected, or refusing to hold charge, this is a direct cell swap at the same voltage and capacity.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSM-M205 series compatibility:\u003c\/strong\u003e\n    The SM-M205, SM-M205F\/DS, and M20 Duos all share the same battery bay geometry, connector pinout, and 3.85V nominal voltage rail — so one cell fits the full variant range without any 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 the SM-M205 platform. The BMS handshake completed cleanly, the charge IC accepted current at both standard and fast-charge rates, and voltage under full display-and-modem load stayed stable above the 3.4V cutoff threshold.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    On first installation, disable fast charging and run one full discharge-charge cycle at standard current. This lets the fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before high-current charging begins — otherwise percentage readings will drift.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Galaxy M20 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe M20 uses a fuel gauge IC that builds its charge model around the original cell's discharge curve over hundreds of cycles. When you install a new cell, that calibration data no longer matches the physical cell. The gauge may read 40% while the actual cell voltage is already approaching 3.5V. One full discharge down to automatic shutdown, followed by a complete charge to 100% at standard current, forces the IC to rebuild its model against the new cell. After that cycle, percentage accuracy stabilises.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the replacement cell\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage cliff issue, not a capacity problem. When the modem, display, and processor all pull current simultaneously — during a video call or network handoff, for example — cell voltage drops sharply under load. If the fuel gauge IC still holds a stale discharge model, it shows 25% on screen while actual cell voltage collapses below the 3.4V protection cutoff, triggering an immediate shutdown. The fix is the same recalibration cycle: drain the phone to auto-shutdown, then charge uninterrupted to 100% at standard speed. Check that the reported percentage matches stable voltage of approximately 3.7V at the 50% mark after calibration is complete.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43392009437274,"sku":"BWCS-SMM200XL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43392009470042,"sku":"BWCS-SMM200XL-2","price":30.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43392009502810,"sku":"BWCS-SMM200XL-3","price":33.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SMM200XL-1.webp?v=1779142921","url":"https:\/\/batteryweb.com\/products\/samsung-galaxy-m20-replacement-battery-385v-4900mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}