The only time it was an ever an issue when I used one, was I plugged it in, I went to the bathroom, I got a coffee. And it was charged enough to use it until I

The only time it was an ever an issue when I used one, was I plugged it in, I went to the bathroom, I got a coffee. And it was charged enough to use it until I could charge it for hours later. The sleep cycle of a mouse microprocessor is 99.9%+. A few minutes charge will get you hours of use.