Dear All member of Techspot and moderators. Recently, My computer is starting change time and dates . 1st day before Normal computer use: work, homework, play, Yehhh! <expression> 2nd day, when I turn on the computer, it show me today is "March 13, 2014. 3PM" Time and Date is wrong. I manually change correct time. 3rd day, the computer change its time and day again, fix it manually. Basically I do 2nd and 3rd repeatly. I researched about this problem: I might need change the battery. However, I really want to know what is the most important thing to do before I replace the battery. Do I need back up all my saved data in computer ? Also, what if I do not replace the battery ? I mean what is the worst situation. From neowing.