Each time this notification pops, I fall for it and get sidetracked. The device in the title of the notification (see screenshot) is wrong. It's not the keyboard. The battery of the mouse is running low. Also, the icon should of course be that of a mouse, not of a keyboard. Could this please be fixed in a future update?

P.S. I was sidetracked for about a minute. The 3 notifications branded as "5 min ago" are from me taking batteries out and putting them back in one-by-one to find out which one was low (red led). (It's possible to run the mouse on just one battery.) Turns out both were running low. It wasn't a flood of notifications. So don't worry about it.