Adjusting automatic shut-down on battery?

Before installing Mountain Lion this summer, I used to have a slider or some way of controlling when my Macbook (13-inch, Aluminum, Late 2008) shut down on battery power. I was able to set it for 10% battery life or whatever, and go through a full discharge cycle. There were also warning pop-up alerts, letting me know when I was in critical time zone with battery life, and I think there was even a message like "you have 15 minutes of battery power left."
Now with ML and the last two updates, my battery reaches about 30% battery life and poof! everything goes black. No warning. No pop-up alert. Just a black screen.
I've searched Apple, the support forums and the web for a fix and the closest thing I find is info about UPS and uninterrupted power. I'm sure there is an easy way to adjust this in system preferences but I can't seem to find it. This is what my energy saving options are:
It's bad enough ML has reduced my battery power in half (I'm down to about 2.5 - 3 hours when I used to often get more than 4.5 - 5 hours), but this automatic everything-goes-black shutdown when I have 30% battery life is making me want to throw my laptop out the window. (And don't even get me started on the Spotlight indexing problems I'm having again with the 10.8.2 update... I've tried multiple things with that and am delaying the pain of having to reinstall ML for the third time since it came out this summer). FWIW, I have 290 battery cycles, but until ML I didn't have any sort of battery life issues.
Can you point me some direction? Thank you!

I'm having the opposite problem...
I leave it playing music in my speaker dock, and it shuts off on its own after about 1/2 hour even though I'm still listening.
I have not been able to find any controls for controlling or disabling the auto-sleep.
Please let me know if you find anything related to this

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