Is this normal?! I leave my imac on sleep whenever i am not using it and does that wear down the battery at all? I just replaced the mouse battery yesterday and it is already down to 4 bars! I can't actually afford to keep replacing the batteries at this rate and i am considering selling it to get a wired Mouse. The wireless keyboard is doing fine and has only gone down to 4 bars and stayed there since i have had my imac (December). Any feedback would be appreciated and since packs of batteries are like £8 it is going to cost a lot ot keep it working at this rate and also replacing the batteries is a pain, i have to wait for minutes for the mouse to reconnect properly.