Of course, this all looks and sounds really scary, but if a 1000 robot-obsessed Japanese scientists haven't been able to build any normal-looking androids this big that don't fall over and don't require a gigantic power backpack of batteries, it's tough to believe that three crafty Bulgarians will do it.

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These turned out to be thin-film photovoltaic cells, of the sort that could be sewn into a backpack and used to power a laptop.

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Resembling a small child wearing an astronaut outfit with a backpack (for the battery power source), the ASIMO could walk on two feet at speeds at over three miles per hour.

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It's just what the name says: a backpack-like bag that provides power to charge all of your gadgets while you're on the go.

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For example, a device called the nPower PEG, introduced last year, can be stuck in a backpack or briefcase where it generates emergency power from the motion of the body.

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Instead of a pressurised gas container, the backpack uses a lithium-ion battery to power the airbag with a fan.

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In pursuit of power, he has wrapped his panel around his jeans and clipped it to his backpack.

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