YN4L 3500mAh Extended Battery for Samsung Galaxy S II 2 Attain i777 AT&T with Black Extended Back Cover + Wall Dock Charger Bundle HIGH QUALITY BATTERY CELLS: This YN4L Samsung Galaxy S II 2 Attain i777 AT&T Extended Battery is manufactured and tested under strict quality control standards. This Extended Battery will provide you with up to 500 Lifetime Charge Cycles with a high-speed and efficient charge. Keep your phone powered with our high quality, rechargeable Lithium-Ion batteries. An excellent, high-capacity Extended Replacement for your original Battery. Great as a spare Battery! COMPATIBLE WITH: The YN4L 3500mAh Samsung Galaxy S II 2 Attain i777 AT&T Extended Battery is compatible with the Samsung Galaxy S II 2 Attain i777 AT&T REPLACEMENT / SPARE / BACKUP BATTERY: Almost doubles your talk time, browse time, and standby availability with a capacity of 3500mAh! Includes a special, high-capacity extended back cover for your phone. ***The original battery door that came with your phone will not fit your phone while using this battery*** PACKAGE CONTENTS: 1 X YN4L Extended Battery ; 1 X YN4L Black Extended Battery Back Door Cover ; 1 X ARC Wall Dock Charger SATISFACTION GUARANTEED: If you are not 100% satisfied with your order, just let us know. Customer satisfaction is our #1 priority. Be sure to buy from DealArmy for authentic items as they are the only authorized seller of YN4L batteries on Amazon!