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That area gets hot from cpu usage and from writing video. If you get a battery grip then the battery won't get hot.

So your saying that the cpu is heating up and the radiated heat is warming the battery compartment and battery?

I was not writing video in any of the tests, just exploring the ML menus and using magic zoom.

I really like the functionality of ML and appreciate all the work the developers put in, I'm just a bit concerned about the heating issues with the battery.

Does magic zoom require the processor to work that much harder that it would heat up like that?

Yesterday I installed ML 2.3 for the first time on a new 600d.  Install went normal and all functions worked as expected. Although, when I removed the battery (Canon) to recharge, I noticed it was very warm to the touch.  At first I though I played around with the camera too long examining all the functions of ML, but (after the battery was recharged) I went back in for approximately 15 minutes to set up the functions of ML that I would use most often and noticed that when I pulled the battery again it was hot or at least very warm.

The only functions I had turned on were: magic zoom, exposure override, and manual mode on everything else.

I was concerned so I ran a few test, recharging the battery between test.

First, I rebooted and bypassed ML and used the Canon firmware. I used the Canon zoom function several times to achieve focus, then bounced around in the menu settings like I did when booted into ML.  After 15 minutes I removed the battery and noticed it was not near as warm as the previous session.

Second test, This time I booted into ML and turned everything off other than Global draw and played with the menus.  After 15 minutes, I checked the battery and it was about the same as the first test.

Third test, booted into ML again and turned on the magic zoom and exposure override.  Keeping the magic zoom window open for the entire 15 minute test, and playing within the menus as I did in test 1 and 2.  I removed the battery, and sure enough it was very warm, almost hot. Much warmer than the previous two test.

Now I did not do any test to determine the amount of draw on the battery other than the charge times which were about equal in all three test.

Has anyone else had these issues?  I'm sure magic zoom can't draw that much juice that it would cause the battery to heat up.  Just concerned and I don't want to fry my new camera.