Mobile terminals and communicating computers have generalized with lots of optimisation in their design and power. It seems that today appears a gap between the best known batteries and the still increasing power requirement of broadband multimedia terminal for a given mass and volume. This paper presents the probable energy requirements targets and lots of ongoing researches on power consumption, energy sources, storage, and conversion. As the number of terminals is also increasing, there will be also a vision on a "universal chargers" and associated sources