Old life. New life

Old life: You would not believe the complexity of the software that manages the battery in a mobile phone.  That area was the remit of a team I worked in, and its complexity put things like USB and Bluetooth in the shade.  But then, the battery is the most dangerous component of the thing you're holding to your head.  Forget radiation, go Google 'exploding phone battery'. Warning: it's not pretty.

New life:  A guest has left one behind...