Macbook to LED display: help me save my battery!

I have a brand new macbook pro 13-inch, and i have it connected to an apple LED display (the one that came out right before the new thunderbolt led display). There are 3 connections from the macbook to the display. One goes into the power supply port  one into the DVI or thunderbolt port, and the other into the USB.
I am wondering why i can't just remove the first one (the power supply) without my external monitor turning off?
Why should that happen, when the monitor has its own power supply coming from a cord plugged into the wall, and why can it not just run off of my laptops battery?
The reason i'm asking is because i don't want to have the power supply constantly plugged into my laptop anymore. The last laptop that i did this with, the battery expanded and warped my computer.
I very rarely use my laptop as an actual laptop, so i like this setup where my laptop acts as sort of a desktop computer, with wireless keyboard and mouse connected.
i have no other way to drain the battery essentially, but when i unplug it, the external monitor turns black. is there some way to stop this from happening? I dont understand why it would effect the monitor when it should be getting it's power from the wall.

By design, the iphone will sync itunes content with ONE computer at a time. If you attempt to sync such content with a second computer, ALL itunes content will first be erased from your phone & then replaced with the content from the second computer. This is a design feature & cannot be overridden. Because you formatted your computer, the iphone will see your computer as a "new" computer.
1.First, disable auto sync when an ipod/iphone is connected, in preferences, in itunes, which in windows is in the edit menu.
2. Put one contact & one event in whatever programs you use for that purpose on your computer, they can be fake, doesn't matter, the important point is to have one entry in each.
3. Connect your phone, itunes running, DO NOT SYNC.
4. Go up to Store>Authorize this Computer.
5. Go up to File>Transfer Purchases. All of the purchased itunes content on your phone will be transferred, music you ripped on your own will not be transferred. You will have to use third party software to first extract that music from your phone BEFORE YOU DO ANYTHING. Same for photos not in your camera roll, the photo sync is one way...computer to phone. This is one example:
http://www.wideanglesoftware.com/touchcopy/index.php
6. Right click the phone in the device pane & select Reset Warnings.
7. Right click the phone, again, & select Backup.
8. Right click the phone, again, & select Restore from Backup. Select the backup you just made.
9. This MUST be followed by a sync to restore your itunes content, which you select as before from the various tabs.
You'll get a popup regarding your contacts & calendars asking to merge or replace, select merge.
This article details what's included in the backup you'll make & restore from:
http://support.apple.com/kb/HT1766

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