The folks over at EFO are at it again, this time they’ve got something of interest for you iPhone 4 owners out there who want more battery life.

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. If prioritizes consumption, pulling power from the Power Pack first, maximizing the iPhone’s internal battery.

 

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Specifications :

  • Battery type : Lithium-ion battery

  • Weight : 74g

  • Product compatibility : iPhone 4

  • Standby time : up to 390 hours

  • Talk time : up to 6.5 hours

  • Internet use : up to 6.5 hours on 4G and up to 8 hours on Wi-Fi

  • Audio play : up to 31 hours

  • Video play : up to 9 hours

Video Demonstration : http://www.youtube.com/watch?v=hGkBeObhaGE

Product Link : http://efo.buy-lowest.com/mobile-c-88/iphone-4-external-power-pack-p-282

Price : US$28