Abstract: A case, batteries and data storage are provided for an electronic device, comprising a casing defining its shape around the outer shape of the electronic device. The rechargeable battery cells and data storage are housed within the thickness of the case. An internal interface engages a corresponding interface on the electronic device to provide power and data communications to the electronic device. The case will be electronically coupled with the internal interface of the electronic device to transmit data to and from the case. The case will also provide integrated communication interfaces and possessors that can be used by the electronic device. The case has the unique ability to simultaneously use multiple electronic ports that exist on the user's device both for electronic communication and mechanical fastening between the device and case.