Killing My Computer!

While wrestling with the inoperative wireless mouse earlier today (see previous post), I unplugged the power cord as one of many wild actions I took to see if it'd revive the mouse power. Then I forgot about the power cord, forgot that I should at least be keeping track of the "power remaining" message that the computer gives me. So, when it got down to about 5%, the screen went to black and the computer died! Took me by surprise, I promise you that!!! I've used battery power before, of course, but usually not sitting right here near the charging station, so I was taken unawares when it died. I never had used the battery power down to that level, so at least now I know what it does when it's at the brink of death. It saved all the files I had open (some on the Internet and some MS WORD files)and everything was smoothly restored once power was back on.