SG External Battery Case for Samsung Galaxy S6 4200mAh Ultra-Slim Protective Cover (White) The backup battery case build-in Lithium ion polymer batery,which is high power, miniaturization and lightweight, easy to carry and protective case; Its looks fasion in curving design and durable from the front, looks ultra-slim from other side view, with good touch feeling; The powerful 4200mAh can provide more than a full charge for your S6,its cycle life more than 500 times, about 4 hours will be charge full; Provides a non-slip backing so it is easy to grip and hold on, intelligent IC can effectively avoid short circuit;