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Clool but with ads.
It is by far one of the coolest Battery Savings app that I have used better than the overrated Greenify. But it only has one flaw, since it is funded through ads , you just have to bear with it. It is not intrusive though but it spoils the beauty of my startup screen. The rest without the ads are so cool. It even manage to beautify somewhat your startup screen.
Pros: Beautify screen, statistics, functionality
Cons: Maybe a paid version without ads