US Patent 10088865 Modular computing system

A modular computing system includes an electronic device and a case. The electronic device has a cavity formed by a thin portion and a thick portion. The case has an auxiliary portion that fits within the cavity of the electronic device when the electronic device is docked with the case. The electronic device has a device battery and the auxiliary portion of the case has a case battery that electronically couples with the electronic device when the electronic device is coupled to the case. The electronic device has a display assembly coupled to a cover glass, and the cover glass has two apertures providing two respective buttons within the apertures.