Replaceable smart battery pack, a battery pack holder and a mobile power supply system

A replaceable smart battery pack (100) for use in a mobile device, the battery pack comprising a number of cells (B1 . . . . B4), and a smart battery management system (102) for controlling and monitoring the number of cells, the smart battery management system is controllable by means of a first protocol using a bidirectional 2-wire bus (SMBus);

• wherein the replaceable smart battery pack further comprises at least one sensor (108, 110) and an additional processor (104), wherein the at least one sensor is configured for detecting a touch profile of a user or a magnetic field and generating a corresponding battery pack control signal, the additional processor is configured to receive the corresponding battery pack control signal and to communicate with the smart battery management system by means of the first protocol in response to the corresponding battery pack control signal;
• and
• wherein the additional processor is further configured to communicate via a second protocol other than the first protocol with a device external to the replaceable smart battery pack and to communicate with the smart battery management system via corresponding commands of the first protocol in response to the commands of the second protocol.