How to Avoid another Black X Over the Battery?

Forgive me if this is already a topic. If so, please direct me to the correct thread.
I was recently working on my Late 2010 Macbook Pro 13 inch laptop when it just shutdown. It took about 5 minutes to start back up, and I immidatley noticed that there was a black X over the battery symbol, and the fan was running at a full (and a very loud) speed. I shut it down and plugged in the power cord, which only glowed very faintly.
After some googleing, I figured out what was wrong and fixed it using a different thread. I basically had to restart the SMC. The thread I used is here: http://support.apple.com/kb/HT3964
However, even though it helped me fix the problem, it didn't answer any questions. So, if you could please help me. Why did this happen to my Mac? How did resetting the SMC fix the problem? How can I avoid this problem in the future? Is this an issue with the battery, or is it something else?
I want to know what I did to make this happen and how to avoid it in the future, if it's possible. All input is appreciated. I am not very computer savy when it comes to the inner workings, so I'm hoping someone smarter than me can help me understand what just happened with my computer.
Thanks!

An SMC reset can 'fix' several battery issues -
A portable Mac doesn't appear to respond properly when you close or open the lid.
The computer sleeps or shuts down unexpectedly.
The battery does not appear to be charging properly.
The MagSafe power adaptor LED doesn't appear to indicate the correct activity
- but I've no idea why you had your problem in the first place, so I can't tell you how to avoid it in the future. Maybe you let your battery drain completely down? I don't know - but now you know the 'fix' for it should it happen again.
Clinton

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