Samsung m500 - How to remove the battery???

How do you remove the battery on a Samsung m500???

I'm trying to slide the battery down while pushing at the top of the battery, but it won't budge!

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Well... It's open. My thumb is SORE!

I ended up pressing down on the back of the phone with the heel of my hand. The cover finally slid off as expected. Not sure why it was so hard to take off in the first place!