I am pretty sure my M$ mouse is broken. I got the Wireless Optical mouse, not sure of the name. It came with the Office (black) Keyboard by M$. The mouse is awesome. Great size and everything. The only problem is that the batteries are only good for 3 weeks at most. I have tried many brands and the longest they are good for is 3, maybe 4 weeks. This can't be normal. I am spending a fortune on batteries How long should they last ? I use my PC for about 4 to 5 hours a day on weekends, and maybe 3 hours a day durring week days. Plus, when I first got the mouse all the batteries I used leaked acid all over the place. P.S. I am looking for a new wireless mouse, so does anyone know of any good ones ? I saw the MX700 by Logitech. Pardon my spelling. That one looked cool. I also saw a Blue one by M$ that was looking pretty nifty.