― Carat is an intelligent and very useful free app for iPhone and Android that will help you to improve your device battery life by providing you personalized recommendations. “Restart Evernote” – Expected Improvement: 5 hours 40 minutes. Kill Skype. Expected Improvement: 1 hour 30 minutes. These kind of recommendations you will receive once you install Carat. How It Works Just install Carat, and Carat will quietly take measurements from your device and send them to their [...].