You all don't use rechargeable batteries in your wireless keyboards and mice? I do. Logitech M570 lasts _forever_ on a single charge. I still hate that it doesn't come in a wired version. In fact, I just wrote to them about it last week (again), after opening up two of my Trackman Wheels, cleaning them out, getting the left and right click buttons working again, but not the scroll wheel (...entirely -- one only goes up, the other only goes down).