suitable for the S4 - with TipExchange

circuitry tailors output voltage and charging current to exact specification of the S4 (accurate to 0.1v). easy to operate. connect S4 , press activation button on pack, and charging begins. start guide included. : (7800mAh lithium polymer), port (microUSB), ( USB), ( S4 ), (2.75 3.25 0.75 inches), TipExchange enabled () with high capacity lithium polymer rechargeable battery technology (28 / 7800 mAh) in a compact design. with a front facing LED display that clearly display the current battery capacity at the touch of a button more scoping out airport waiting rooms for AC plugs. more sweating in the parking lot waiting for your S4 to charge. the family plugged in on camping trips or the office wondering how you are always so utterly available. , and extremely durable, the for the S4 is the perfect addition to any nomads road arsenal. you need an extra boost to squeeze some extra hours out of the S4 or you are resurrecting it from the dead, the keeps you mobile, agile and free. yourself an independent and free-moving provider of energy!