What is the good way to charge the battery

I don't know if this topic been answered before.
I want to know what is the good way to charge the battery on Macbook pro? Should I start charging battery when it's 50% or 20% or 10% left? and Is it good to leave the charge plug in after it fully charged?
thanks guys

Everything you need to know about your battery is explained here:
http://discussions.apple.com/thread.jspa?threadID=1764220

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