What’s greener, running laptop batteries to empty, or constantly charge them?

arvin b asked:


With Lithium Ion batteries on laptops, there’s not much of a problem of battery memory anymore, so one can charge a laptop battery whenever, without having to wait for it to completely discharge.

But what’s better overall for my battery’s life and the environment (i.e. saves electricity), if I keep my laptop plugged in at all times when I don’t need to go portable, or only keep it in enough to charge it, and then let it run off the battery until it runs out of juice?