In fact any games consume large amounts of battery power, but with Pokemon GO, this situation is much more complicated.
Since the search for Pokemon on your smartphone screen is always on the energy consumption increases. To fix this go to the game settings and put the “Saving energy” mode.
Then we recommend that you download the app Battery Saver. This application allows you to reduce battery consumption by painting pixels of the screen black.
Use Screen Backlight OFF application that runs through the curtain notifications and off the screen backlight.
Turn off all sounds and music in the game, because of the dynamics also quite discharge the phone.
Well, the easiest way is to use the Power Bank