What is the recommended way of preserving battery life?

I'm a bit confused. How do I preserve the battery life for an old (2008-ish) model of a white MacBook?
Some part of the internet says that:
Letting the MacBook plugged in to a power outlet even if the battery is full will result in the battery degrading its life (aka do not overcharge the battery because it's bad).
Another part of the internet says:
Removing the MacBook's power adapter when the battery is full will result in the battery degrading its life because it will get used more. (aka the battery will be overused because of not running on power adapter which is bad)
So can anyone clear this up for me? I's really confusing and I need a definite answer, thanks!

Apple Portables: Tips for maximizing your battery charge
http://www.apple.com/batteries/notebooks.html
Stefan

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