When The MBP is plugged in (power adapter) what happens with the battrey

I have the newest Macbook pro, the one you cant take the battrey out from..
I just want to be sure, when my macbook pro is using the adapter, the battrey life time is being saved, is that correct?
I ust to plug in my iPod and another hardrive for time machine, i just want to know that the both of them wont eat my battrey, and anyway, that i use my battrey correct by using most of the time the power adapter and not the battrey...
thanks for the answers to come...
**sorry for my lame Eglish...**

+when my macbook pro is using the adapter, the battrey life time is being saved, is that correct?+
Even when you have AC power connected there may be times it draws power from the battery as well, that's the way it's designed to manage power peaks.
Apple suggest you use the battery for a while every day then re-charge it and every couple of months re-calibrate it for best long term performance.

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