Battery life is one of the biggest issues in the Android world
today. Take your SIM card out, turn off Wi-Fi and never touch it
and it'll sit there happily, lasting for a whole week on one
charge. But try to use it for anything "smart" and, well, that's
where the problems start.  It's a pretty sorry state of affairs
when we count the uptime of today's smartphones in numbers of
hours rather than days, with the standard metric of decent
battery life being whether a phone can last a whole working day
on a single charge.  So are there any realistic things you can
do to improve your phone's battery life, other than just
switching it off, putting it a sock drawer and hoping no one
ever wants to call you?  Yes, yes there are. Of course it's not
possible to suddenly double your Android phone's uptime by
magically tweaking a few settings, but you should be able to
squeeze out a few more hours of life from even the puniest of
batteries without compromising on performance too much.  Here
are some easy, not-too-compromis