Is it safe to always keep the PC plugged in after removing the battery pack?

As I'm not going to move my pc for some time, I have removed the battery pack and use the AC power instead.
But I would like to know whether its safe to keep it plugged into the AC 24/7? and does it consume energy or does it damage anything when the pc is switched off?
T400 2764CTO, Win 7 Ultimate 64-bit
Solved!
Go to Solution.

its okay, i use to do it all the time with other thinkpads when my battery died on me. It won't damage your laptop.
Regards,
Jin Li
May this year, be the year of 'DO'!
I am a volunteer, and not a paid staff of Lenovo or Microsoft

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