A:AnswerDepends on how many apps you have running and use and well as what you're doing on it. Watching videos on YouTube will definitely drain your battery pretty fast
A:AnswerYou can try turning it all the way off and if that doesn't work and if there isn't anything you are worried about losing I would factory reset it.
A:AnswerAs long as the new Kindle has enough storage room, all your music and book data should transfer as long as you register the new device as the same Amazon user.
A:AnswerIf you have Amazon Prime you can temporarily download video content for viewing without an internet connection. The amount of content depends on which model you get which determines the available storage on board.