Why does my phone battery suck?

Most people use their phones every single day for communicating with others, using the Internet, playing games via apps. There’s nothing worse than looking down at your phone and realising the battery is running out of juice—or worse yet, that it’s already completely dead. One of the most common problems with smart phones is a quickly-draining battery. So why does our mobile phone battery suck? To find out we visited Dr David Howey, associated professor in the department of Engineering, University of Oxford to find out!