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The charger should make no difference other than the speed of charging.
It is better for the life of your battery if you keep the charge as high as possible and not let it completely discharge.
The battery will lose some charge even when it is off as the power is being used to keep power running to the memory so your files are not lost. Though I have never seen it as much as a 10% loss. Are you closing your programs before you shut it off? Do you use switcher bar to actualy close them or are you just clicking the "X" in the upper right corner? The X only minimizes most programs and does not fully close them.
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