Cinema display MagSafe

I have just connected a new 27" Cinema Display to my MacBook Pro. All is working very well. However I have a question.
When I remove my MagSafe connector, coming from my Cinema Display, while the computer is running, it immediately goes to sleep. Is this normal?
BTW I was removing the MagSafe to allow the battery to run down.
Thank you.

What kind of Macbook Pro do you have?  The Retina Macbook Pro needs a different magsafe.  If you have the retina Macbook Pro, you can buy the Magafe 2 adapter.
http://store.apple.com/us/product/MD504ZM/A/magsafe-to-magsafe-2-converter?fnode =5a

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