I recently replaced my motherboard battery. I did this in an effort to see if I could get my monitor to work again. I felt that it might be one approach to troubleshooting a few subtle problems that I was beginning to encounter. One problem was my system couldn't be awakened from sleep unless I pushed the power button on the tower itself. Ultimately my monitor needed to be replaced. However my sleep problem is now back to normal. I couldn't remember if I had ever replaced my motherboard battery and so after seven years I felt that it couldn't hurt to replace it. What surprised me was how much the battery itself cost. It was about $25.00. Bill