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Message: <blockquote data-quote="ADKhikerVW" data-source="post: 950954" data-attributes="member: 36483">For the vast majority of circumstances the MBP will run entirely off the AC power when the battery is charged.  However if there is a situation where it simply cannot get the power it needs from AC alone, it will tap into the battery briefly to make up for it.  This is why if the battery is removed from a Mac notebook with a removable battery, the processor speed is throttled back, to prevent a situation where too much power is being demanded that the AC alone cannot provide.You underestimate how advanced the technology in these notebooks really is.  It is more than smart enough to manage the charging (and not charging) of the battery.  Leave the battery in and forget about it, just remember to calibrate it occasionally.</blockquote>