Amazon.com: Battery Replacement for Samsung GT-I9100 Galaxy S II Galaxy S2 EB-FLA2GBU EB-F1A2GBU EB-L102GBK (2600mAh/3.7V) : Cell Phones & Accessories
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Original Samsung Galaxy S2 Battery EB-F1A2GBU, 1650mAh, for S2 i9100 | eBay
Samsung Battery for Galaxy S2, SII GT-I9100, SII GT-I9100G, SII GT-I9100T Smartphones and EK-GC100, EK-GC110, EK-GC120 Cameras - Newegg.com
3600mAh Extended Battery with Door Cover Case for Samsung Galaxy S2 SII I9100 White - Walmart.com
Skin-Deep Authenticity: Tearing down a “genuine fake” Samsung Galaxy S II battery | Rip It Apart - Jason's electronics blog-thingy
Replacement Battery for Samsung Galaxy S2 SGH-T989 - Battery Warehouse