Battery powered device

摘要

A battery powered portable electronic device includes an interchangeable battery pack (2). The battery pack is fitted to the main unit (1) of the device. An auxiliary functional unit (AFU) (10) is contained within the battery pack (2). It communicates data bidirectionally with circuits within the main unit (1) of the device. The auxiliary functional unit thereby performs an auxiliary function in conjunction with the circuits in the main unit of the device. The auxiliary functional unit may be a pager and the main unit may be a cellular telephone. Then in a standby mode the phone circuits are switched off and the pager only left powered-up.