First I would like to tell you there is no app which can increase your battery life by large amount all such app are fake totally but yes some app can improve your battery by little amount and this can be done by limiting your fuction which may effect your mobile functionality.
Now talking about this app I used this app and believe me it didn’t do anything just except showing ad by which such app make money nothing improvement I can’t see in my mobile just totally fake and sometime it just got hang because of which my mobile also get hang so I need to reset my phone after uninstalling it.
This app not only fake but with lot of bug after installing it my phone speed suffer a lot. So guys I didn’t suggest you to install atleast this app.