Question: why does my phone go dead in my pocket?

Mark Collins answered on 6 Nov 2015:

Your battery is made of Lithium and carbon and when you charge it at home, the atomic bonds are full of energy and the battery appears to be full! Unfortunately this atomic charge, it is like holding hot potato, the atoms can hold for so long but eventually they let go and we lose some charge…some battery life! As the day goes on, more charge leaves and the battery slowly decreases in your pocket! And as a battery gets older, its ability to hold a charge is less so it has to lose and you battery will drain faster! I hope this helps!