Cell phone charger to wear on your belt

One of the many inventions from the British Invention Show held in London since last Wednesday through Saturday and posted in a gallery on Repubblica.it.
It's a cell phone charger that you wear on your belt.
The show is covered in an article on the BBC for those who want to read more about it.
<--Earlier this year, TRF picked up on a solar charger that recharges your cell phone while on the move - using daylight - which seems like an even better idea.