I like this computer, and had another just like it for about 5 or 6 years.  I bought a refurbished model because I was familiar with the computer.  There seems to be an issue with the battery at times.  I get a message that the battery is very low, but the battery indicator indicates that the battery is full.  I never had this problem with my first computer. I leave the computer plugged in at night and when I get on in the morning there is a message that there is some battery issue and that I need to turn off the computer and disconnect the plug from the wall and then plug it back in.  Sometimes there is a black screen, so I try to unplug the power line from the wall outlet and then the picture comes up and computer works fine on the battery.  Something seems to be happening with the battery, but I have no idea what the problem is.