Samsung Galaxy S4 battery life problems

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http://forums.androidcentral.com – I had my S4 since launch and the battery life was amazing. It could last 1 day and a half with little use but now it could hardly last 14 hours. I don't know what is going in as the culprit is Android OS, Device idle, Whatsapp and Google Services. How can I change my settings in order to get back this amazing battery life? And by the way the phone gets hot when I wake up in the morning with the battery at 20-30% after charging it the night before. Attached Images Screenshot_2013-07-16-08-11-44.jpg (151.4 KB) (HowTos)