How to increase the battery life of your android smartphone ?

Saving your battery life isn’t rocket
science—the most important thing is to
get rid of the things that are draining
the battery the most, and trim down
other things that you need to use. Click on Settings –> About Phone –>
Battery use - to see what has been
killing your battery .From there you would notice that the brightness is usually high than what you require so Head into Settings –>
Display –> Brightness, where you can
choose to automatically  adjust the brightness levels.  Another important factor is to adjust the screen timeout so Go to Settings > Display >
Screen timeout to change the interval
before timeout of your screen; you
may need to try out a few different
times to find one that is suits you.By far, the biggest hit on battery life is the cell data and cell phone radios constantly hunting for signal. A study showed that when you put the phone on airplane mode the battery lasts for 5-6 days!
Even with wifi on! So the key is to be
able to just use wifi as much as
possible and shut off all cell
communication and whenever you feel the need simply kill Airplane Mode and you get back on the cell network. Turn off the sync - When applications such as Twitter,
Facebook, and Gmail are all allowed to
automatically sync updates/emails,
your Internet connection is left on,
waiting ready to request the updates
at whatever intervals you have it set
to. Increasing the length of time
between updates will help improve
your phone’s battery life.
Even better is turning off sync
completely – meaning your phone will
only update when you manually
request it to do so in each application.
While it’s slightly more effort for
updates I found my phone was less of
a distraction after changing this!
Battery life also increased. Use task killers - These are applications which kill programs that run in the background and hence help in freeing the ram . One such application which i personally use is automatic task killer that can be downloaded from google play. If your phone supports features such
as GPS and Bluetooth you more than
likely don’t use them all the time, and
if left on they can be an unneeded
strain on your battery, so turn them
off if they’re not being used! The same
applies for Wi-Fi and 3G support. An interesting thing to note is that do not use live wallpapers unless you are a big fan of the same and also try not to use vibration mode when your phone is silent because both these have a slight effect on battery life. Another easy way to control the apps that run in the background is to use the phone's built in features . . To do this go
into the settings menu and tap
“applications.” Then hit “manage
applications.” Shut down
applications you aren’t using, or
ones that are eating up battery life,
by clicking on the name of the app
and then tapping the “stop” button. Another recommendation would be to turn the phone into power saving mode.
However, this mode is not included
within all Android smartphones, but
those that have it will be able to
reduce the screen time-out, turn off
the vibration, disable homescreen
animations and lower the display's. Finally i would like to conclude that following all these steps would limit the phone's functionality but if you are ok otherwise then using the charger is not a very big task.