I bought a fairly cheap wireless mouse a while back. With the batteries it came with it lasted quite some time, at least a few months, before it died. I bought new batteries from the store that were on sale and put one in. About a week later I found that the usb plug had come detached from the mouse while in transport and the battery had been draining for quite some time. Since then all of the batteries I have put in it (still from the package I mentioned previously) have only lasted a matter of a few days before starting to die. Question: Is this common for wireless mouses? or at least the cheap ones? Or does it seem like it may be these batteries I am using? The batteries are copper tops by the way, not some off brand, but they were out on sale so I was thinking maybe they are old.