If I agree with you completely on the headphones, I cannot help but disagree on the mouse.
Cordless mouse have come a long way in the past decade. They are very reliable, and working with a cord attached is something I simply cannot do anymore on a daily basis.
In my Logitech G602 I put two AAA batteries and they last me for three or four days of daily use, plus gaming evenings. Not too shabby.
That said, I have a respectable amount of rechargeable batteries and yes, I admit that I have a set in the charger once a week.
Next to my Samsung Galaxy A3, you'll excuse me if I find that peanuts as far as hassle goes . . .