Zerolemon Travel External Battery Charger for Samsung Galaxy S4 I9500 - Fastest External Charger This item is Compatible with the ZeroLemon Worlds Highest Capacity Extended battery for the Galaxy S4 This item is compatible with OEM versions of the battery, ZeroLemon's Slim battery and even the EXTENDED battery! Automatically stops charging when battery is full. FASTEST CHARGER ON THE MARKET Color designed for uniqueness and visibility. USB output: DC 5.0V, 600mAh / Desktop charging output: DC 4.20V, 600mAh.