US Patent 9939872 Reduced-size user interfaces for battery management

A device with a touch-sensitive display and a battery can determine a battery level of the battery, and in accordance with a determination that the battery level is at or below a first threshold value, cause a haptic output and/or enter a low-power mode. While in low-power mode, the device may produce different outputs in response to user inputs than while in a normal power mode. In some embodiments, while in the low-power mode, the device may display only the time and an indication that the device is in a low-power mode.