 The S III 's Li @-@ ion 2 @,@ 100 mAh battery is said to have a 790 @-@ hour standby time or 11 hours of talk time on 3G , compared to 900 hours in standby and 21 hours of talk time on 2G . Built into the battery is near field communication ( NFC ) connectivity , which allows users to share map directions and YouTube videos quickly using Wi @-@ Fi Direct ( through Android Beam ) , and perform non @-@ touch payments at shops that employ specially equipped NFC cash registers . The battery can be wirelessly charged using a special charging pad ( sold separately ) that utilizes magnetic resonance to produce a magnetic field through which electricity could be transferred . 
