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.
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
Price : US$28