First of all, you should notice that I used the term "device" and not "computer" or "laptop". Second, I leave my laptops plugged in 24x7x365 until I retire or replace them. I always have. I've had laptops on and off ever since the early 1990s, and not one of them ever had a battery die. Of course the earlier ones were not using lithium batteries. I agree it is more important today as many laptops come without easy access to replace batteries. But still, I use common sense and have never had a dead laptop battery issue. Not that it would matter that much in my case as I rarely take my laptops off of my desk. But whenever I have or do, the batteries are always up to the task. But of course I rarely keep a laptop more than 4 or 5 years. By that time I'm ready to upgrade to a newer, faster, hopefully better model.