So I just purchased a macbook in august and of course I had to buy the wireless mouse to go with it. A couple of months ago the battery in the mouse died, but at the time I was too lazy to change it, plus I didn't have extra batteries lying around. About a month ago I finally did change the batteries but now the mouse WILL NOT connect to my computer and its frustrating me. My bluetooth is on, when I try to set up a device it shows up but then it says that it cannot connect because its either not in range, blah blah blah.. but it is!

PLEASE HELP because I am not very good with this kind of stuff and I really want my mouse to work, since using the pad on the laptop gets annoying..

thank you in advance!