My year old Nexus 4 battery is depleting much more quickly than before; I'm on Kitkat and I installed the OK Google APK from a link I found somewhere but I haven't been using that feature--just voice command by touching the mic icon-- don't know if that's a suspect. The battery usage attributes most of battery use to display, same as always. I keep the brightness moderate, screen blank as soon as I'm not using it. Is there a way to uninstall this APK? We have been on a new carrier with an unlimited data plan but I didn't see battery depletion as soon as we signed on just before Christmas--don't know if that could be involved, as well. I'm not very knowledgeable about this like backup settings--just tried to disable auto backup.