Pocket paparazzi

The era of gargantuan smart- phones that could double as picnic tables is drawing to a close.

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These new silicon-carbon batteries are the Gandalf of the power world, packing more magical energy into a smaller space than their old-school graphite brethren.

This means phone makers like Vivo and OnePlus are gleefully zapping their top-tier handsets with a shrink ray, serving up pocket-friendly devices that don't conk out by lunchtime.