Technologies are generally described for systems, devices, and methods effective to receive a battery of an electronic cigarette in a mobile device case. A mobile device may be received in a first portion of the mobile device case in such a way that the mobile device is accessible to a user. The battery of the electronic cigarette may be received in a compartment of a second portion of the mobile device case. The compartment may be formed by one or more walls of the mobile device case. The first portion of the mobile device case may be contiguous with the second portion of the mobile device case.