Mine lasts several weeks. Also, it has a little light that turns red when it's low (as in, needs charging within a few days). It can also be used while charging without much issue. When I see the red light, I just plug it in while I'm not using it or doing something like watching media. It's really convenient. I have a mouse bungee, from when I had wired, and the cable just sits there waiting until it's needed.