Portable electric power supply device (1) for portable electric devices (7) comprising an accumulator (3) of electrical energy and a charging connector (5) electrically connectable to the accumulator (3) of electric power and one of said portable electric devices (7) for supplying electric power from said accumulator (3), characterized in that it includes an activator (6) of an alarm signal that is capable of cooperating with an external device (11) to activate said alarm signal. (Machine-translation by Google Translate, not legally binding)
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