Daniel Huang: Battery pack, holster, and extendible processing and interface platform for mobile devices. mophie, Matthew D Bottomly, February 5, 2013: US08367235 (105 worldwide citation)

A battery pack is provided for a mobile communication device, comprising a casing defining a cavity that conforms, at least partially, to the outer shape of the mobile communication device and one or more rechargeable power cells housed within the thickness of the casing. An internal interface engag ...