One of my wireless keyboard is also logitech. I can tell you as much that the battery doesn't last that long. As far as I remember, it's only less than a year since I got them and I have already switched the battery with a new one. The same thing with the mouse that came with the battery. What I like about their keyboard is the comfort while typing, no delays, and the design. I wonder how small that is since I am looking for a keyboard that would fit a small backpack. Mine is quite too big and I kinda wish it to be a tad smaller.