Guys I just came across a really useful thing which I never knew existed... If you enter the following combination *#*#4636#*#* in your dialer it will open a Testing screen where you would see: Phone Info, Battery Info, Battery history, Usage Statistics, Wifi info and Service Info. Now in battery history and usage statistics you could see a much more detailed information than in the battery manager. maybe some of you knew that already but some like me did not. try it out! 
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