Sorry if this has been addressed earlier. I'm a new poster. I'm curious as to what would cause a battery to run down. I don't have a live wallpaper, just a HD one. What else can I do to limit battery use. When reading do I shut off the WIFI ? Do I shut WIFI off when I use certain apps. Just curious. Finally do I turn the tablet off when not in use. I have a rooted Nook Tablet. Thanks all great site.