For that reason, I’ve decided this keyboard / mouse combo is best used for in-the-office / stationary at my desk. I don’t take either the mouse or the keyboard with me. A smaller travel mouse is recommended for that. Battery life – over time, I’ve found myself replacing the batteries on both the keyboard and the mouse.
https://www.amazon.com/Microsoft-Wireless-Comfort-Desktop-5000/dp/B002JCSCYS