2003 Ford Escape

2003 Ford Escape 6 cyl Two Wheel Drive Automatic 133000 miles

I was driving on the interstate yesterday and I just happened to glance at my dashboard and the battery light flickered on and off. If I didn't take a glance, I would have missed it. Is there a major concern here. My co-worker stated my battery cables could be a little loose and/or corroded. What's your take on this? The battery was purchased May/June 2007. How often should I replace the battery.
September 26, 2008.

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