My battery icon has an X over it
My computer turned itself off for no reason that I can figure out and when I rebooted everything seemed okay except that the battery icon has an X over it. This is a later 2008 MacBookPro 15" -- first gen multitouch. I'm running Leopard. When I unplug the little green lights on the side appear briefly, blink several times, and then disappear completely.
What does this mean and can I fix it or what more information should I find?
If I can continue to use the computer as long as I'm plugged in I can live with that.
Thanks for any clues.
MacBook Pro (15-inch Late 2008), Mac OS X (10.5.8)