{"product_id":"t-mobile-galaxy-s2-replacement-battery-37v-3400mah-li-ion","title":"T-Mobile Galaxy S2 EB-L1D7IBA Replacement Battery 3.7V 3400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eT-Mobile Galaxy S2 — 3.7V Li-ion Replacement Battery (EB-L1D7IBA)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 3400mAh Li-ion replacement battery for the T-Mobile Galaxy S2 (Galaxy S II). It carries OEM part number EB-L1D7IBA and slots directly into the standard battery compartment. It powers the processor, display, modem, and all onboard functions.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eGalaxy S2 platform fit:\u003c\/strong\u003e\n    The Galaxy S2 and Galaxy S II share the same battery bay dimensions, connector pinout, and BMS handshake protocol. One cell covers both variants 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 charge and discharge cycles on a Galaxy S2 unit. The BMS accepted the charge IC handshake on the first cycle, and the protection circuit tripped correctly at the low-voltage cutoff threshold.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    After installation, disable fast charging and run one full discharge-charge cycle at standard current. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging is applied to 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 S2\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the cell cannot sustain voltage under high-current load — typically when the modem transmits or the screen runs at full brightness. The fuel gauge IC reads a nominal state of charge, but the cell voltage collapses under load before the gauge catches up. It is not a fault with the replacement cell itself — it means the fuel gauge IC is still calibrated to the old, degraded cell curve. Run two full discharge-charge cycles to let the coulomb counter recalibrate. After that, shutdowns below 20% should stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone shows incorrect battery percentage after cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Galaxy S2's fuel gauge IC stores a learned discharge curve from the previous cell. When a new cell goes in, the coulomb counter starts tracking against data that no longer matches the actual cell chemistry. This causes the percentage to read high, drop suddenly, or jump erratically. The fix is one complete discharge — down to automatic shutdown — followed by a full uninterrupted charge to 100%. After that cycle, the fuel gauge IC resets its baseline to the new cell and percentage reporting stabilises.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405021806682,"sku":"BWCS-SMT989FL-1","price":29.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405021839450,"sku":"BWCS-SMT989FL-2","price":33.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405021872218,"sku":"BWCS-SMT989FL-3","price":36.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SMT989FL-1.webp?v=1779369859","url":"https:\/\/batteryweb.com\/products\/t-mobile-galaxy-s2-replacement-battery-37v-3400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}