How to Saving Android Battery:
There is another app that is notorious for draining your battery, Snapchat. Snapchat periodically loads stories in the background. The benefit to doing this is so you aren’t waiting forever for a story to download; you can watch it immediately. The biggest disadvantage is that it drains your battery in the process.
Many users have reported a slight battery life increase when they disable this functionality altogether.
To Disable Snapchat Background Data
go to Android Settings –> Applications –> Snapchat.
Then select data usage.
You will be taken to a window which shows the data usage for Snapchat over a period of time. Select the option to Restrict app background data. This will disable stories from preloading in the background. Don’t worry, you will still receive notifications. One side effect from doing this is that you will have to wait until your Snap sends before you leave the app or it will not send in the background.