iPhone 4 External Power Pack is a high capacity portable external battery pack which can charge for iphone 4th generation.The sleek power pack snaps inconspicuously onto the back of your iPhone, adding only a few millimeters of thickness, but more than doubling the battery runtime.
Specification
Battery type : Lithium-ion battery
Weight : 74g
Product compatibility : iPhone 4/4G
Standby time : upto 390 hours
Talk time : upto 6.5 hours
Internet use : upto 6.5 hours on 4G and upto 8 hours on Wi-Fi
Audio play : upto 31 hours
Video play : upto 9 hours
Price : US $28
You can buy this product here
Source : youtube
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