I've had this Dell XPS 13 for about 1.5 years and out of nowhere I started experiencing battery problems. It may have been caused from bumping the laptop into something but I'm not sure. The battery either says it is fully charged or that it is not detected. If it says battery not detected, there is an X over the battery icon on my taskbar. Regardless of which state it's in (100% or not detected), unplugging the charging adapter will cause the computer to turn off instantly. It will not turn back on until I plug the adapter back in. It works fine otherwise, just this one problem.