Hmmmm- my original ('07 4.8) battery just died 3 days ago. I never saw a warning light, but could've missed it if it's only on a few sec. at start up.

I'd highly recommend replacing the bat. if it's original. When it died, I couldn't open the back hatch to get to it with out first getting a jump start. Even after the jump start and running it wouldn't go in to gear to be able to drive- I guess not enough voltage to engage the electronic shifter- just got error messages. Save your self some aggrivation and replace it now rather than getting stuck some where. It's only a matter of time.

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Bluesharp.... if you don't blow, you suck!