Your magic mouse suddenly costs 119.98, with a wire. The beauty of magic mouse is that it is plain and simple, a wireless mouse and absolutely nothing else. I always have an additional pair of rechargeable batteries charged that I swap whenever the mouse's batteries run out. I'd rather swap once every two months, than having a wire, pay an additional 49.99, additional desk clutter, and having to place it there daily for it to be any useful. Junk in my opinion. I now have one less thing on my desk, and a pair of batteries ready to be swapped away from sight inside a drawer.
Don't you have a wire going to your battery charger?
I don't understand what the fuss is about. Doesn't the Bluetooth menu give the percentage of battery left on the Magic Mouse? It does for the keyboards and trackpad. Plus, they warn you onscreen when getting low. That's my signal to charge the batteries that night.