In regards to the opening thread, according to my wife it would have to be Whatsapp. Since she always tries to use WiFi as much as possible in adverse to using her data plan, she has noticed that having Wifi on all the time in order to use Whatsapp for sending text, uploading images and other stuff, really puts a strain on the battery. Plus since she uploads and works with Images a lot with Whatsapp, she typically has the brightness settings at the highest level which also affects the drain on the battery.
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