Abstract: The present disclosure relates to mobile devices with e-ink (electronic ink) displays configured to preserve and display critical data, such as responsive to loss of power. The mobile devices may include cell phones, smart phones, pagers, PDAs, and the like, and the mobile devices are equipped with an e-ink or e-paper technology type display. The mobile device is configured to write out critical data to the display upon Critical Battery notification or upon other criteria. In an exemplary embodiment, a mobile device includes memory; input/output interfaces; a processor; an electronic ink display; and an interface communicatively coupling the memory, the input/output interfaces, the processor, and the electronic ink display; wherein the electronic ink display is configured to display data responsive to predetermined criteria.