{"product_id":"samsung-galaxy-s-ii-replacement-battery-37v-1300mah-li-ion","title":"Samsung Galaxy S II EB-L102GBK Replacement Battery 3.7V 1300mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSamsung Galaxy S II — 3.7V Li-ion Replacement Battery (EB-L102GBK)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1300mAh Li-ion replacement battery for the Samsung Galaxy S II smartphone. It fits the GT-I9100 and related Galaxy S2 variants that use the EB-L102GBK cell. The battery slides into the original compartment and connects via the same three-contact puck on the rear housing.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eGT-I9100 and Galaxy S2 variants:\u003c\/strong\u003e\n    These models share the same battery bay dimensions, voltage rail, and contact pinout. The EB-L102GBK also cross-references as EB-L1A2GBU and GH43-03539A — Samsung used multiple part numbers across production runs, but all draw from the same 3.7V nominal cell spec and BMS handshake.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell on a GT-I9100 unit under screen-on load with Wi-Fi and mobile data active. The BMS held stable cutoff thresholds and the charge IC accepted a full CC\/CV cycle without tripping an error state.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first install:\u003c\/strong\u003e\n    After fitting this cell, run one complete discharge-to-charge cycle with fast charging disabled. The Galaxy S II's fuel gauge IC was calibrated against the original cell's discharge curve. A full slow cycle lets it re-map against this new cell before you resume normal charging patterns.\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 S II after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe GT-I9100 runs a combined modem and display load that spikes current draw hard at 20–30% reported charge. A new cell with an uncalibrated fuel gauge IC can report 25% while the actual cell voltage has already dropped below the BMS cutoff threshold under that spike. The BMS reads a real undervoltage condition and kills the rail instantly — the OS never sees it coming. One full discharge-to-cutoff cycle, followed by a slow charge to 100%, resets the coulomb counter and tightens the IC's voltage-to-percentage mapping.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eGalaxy S II not powering on after the battery sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge in storage. If this battery shipped or sat unused for several months, the cell voltage may have dropped below 2.5V — the threshold where most BMS circuits lock out to prevent cell damage. The Galaxy S II will show nothing on screen, and a standard wall charge will not recover it. Connect the battery to a USB charger and leave it for 20–30 minutes before pressing power; most BMS circuits have a trickle recovery path that accepts low current at voltages above 2.0V and will unlock the main charge circuit once the cell climbs back above 2.8V.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405085376602,"sku":"BWCS-SMI9100SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405085409370,"sku":"BWCS-SMI9100SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405085442138,"sku":"BWCS-SMI9100SL-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SMI9100SL-1.webp?v=1779369935","url":"https:\/\/batteryweb.com\/products\/samsung-galaxy-s-ii-replacement-battery-37v-1300mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}