Abstract: According to one aspect, a portable electronic device sized and shaped to be received within a holster having a magnetic element. The portable electronic device includes an electronic compass adapted to measure a magnetic field of the magnetic element in at least two axes. When the measured pattern corresponds to a first pattern, the portable electronic device is adapted to determine that the portable electronic device is in the holster.

Abstract: Systems, methods, and apparatuses for controlling current in an electronic device may involve sensing a first voltage, the first voltage representing a battery voltage. The first voltage can be compared to a cutoff voltage. A current may be provided to power a display based on the comparison of the first voltage to the cutoff voltage.

Abstract: An electronic device may include a first charging port. A peripheral device connected to the first charging port can be sensed. The first charging port can be electrically connected to a battery charger of the electronic device by a first connection and configured to provide a charge to the battery charger through the first connection. The first charging port can be further electrically connected to a battery of the electronic device by a second connection and configured to receive a charge from the battery by the second connection. A charge (i.e., power) can be provided to the peripheral device from the battery through the second connection. A charge on the first connection can be directed away from the battery charger.

Abstract: A portable device automatically stores information (including, if desired, a timestamp) regarding user-interface interactions and then, in response to detecting holstering of the portable device, automatically uses that information to revert to an earlier user-interface interaction-directed state when at least one reversion criterion is also met. The reversion criterion can comprise a set duration of time. This use of the information to revert to an earlier user-interface interaction-directed state can comprise deleting at least some of the information from storage to identify the particular user-interface interaction to be used to determine the earlier user-interface interaction-directed state.

Abstract: According to one aspect, a portable electronic device sized and shaped to be received within a holster having a magnetic element. The portable electronic device includes an electronic compass adapted to measure a magnetic field of the magnetic element in at least two axes. When the measured pattern corresponds to a first pattern, the portable electronic device is adapted to determine that the portable electronic device is in the holster.