... /4S,battery case for iphone ,speaker for iphone,3d case for iphone2,Features: (1)3in1 power case for iphone 4/4S: with protecter case,emergency charger ... product power is 100%4,Battery cells type (1), polymer lithium-ion batteries, standard voltage 3.7 V (2) the capacity: 1800 mAh ... (3) the output voltage: DC5 V + /-0.1 V (4) the ...