How to Charge Macbook pro unibody? correct way

Hi there, I have a question. just bought my Macbook pro unibody last week.
I want to know how to charge Macbook pro the correct way ?
When im working. should I charge all the time ? I should wait until the battery drain 10% left ?
When is the best time to charge the battery 75%,50% or less that 10% ?
Should I turn off asap when the charger once the green light turn on ? should I leave overcharge ? normally I charged mac at night which more than 8 hour charge , is this good ?
Thanks guys.
E

Here is apple's instructions in calibrating the battery KB Article
As for leaving it plugged in, that's the normal process most people do, there is circuitry in the computer to ensure the battery does not get over charged. Aside from calibrating it, I'd avoid any deep cycles, that is draining it completely, you're better off plugging it in when you have the opportunity and not wait until the battery is nearly drained. Deep cycles can shorten the life span of the battery.

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