I am having extremely bad time with my new S4's battery. I have already exchanged the device once and these wakelocks are making my experience a nightmare. Last night i charged my phone to 100% and overnight my battery drained to 55%. I have downloaded wakelock detector and clock and Calendar storage are major culprits. Calendar had 1600 wakelock triggers in one night. I am so frustrated right now. I can't find any possible way of dealing with this situation. How do I deal with wakelocks related to stock apps like clock and calendar.