Hi, I've just bought a new iMac two weeks ago and I have nothing bad to say about it except the battery life of the Magic Mouse. When I installed the mouse it was at 100% and the wireless keyboard was also fully charged. Now two weeks later the keyboard is still at 100% but the mouse is at 58% now. Is it normal? Do I really have to change the batteries every 4 weeks? Apple promised a battery life of 4 months. Does anyone else have this issue? Thank you!