I would say that it's probably best to just use the thing and not worry too much about the battery. Leaving it plugged in all the time might not be the best possible thing for the laptop but it's far from the worst. Actually using the thing on battery constantly is much worse for it. The best thing to do is probably just use it however you normally use it, and make sure you get at least 1 full cycle in a month. That and if you know for a fact that it's fully charged and you're not using it, unplug it as you're generating unnecessary heat, which is also bad for the battery.
No, this might not be the 100% absolute optimal way to do it, but batteries aren't THAT expensive that it would be worth your time to worry to heavily about it.