for quick and easy, i cant recommend the Rock River LED from Target enough.

its cheap and run of the mill, but man is it convenient.
for AA, 30 hours runtime, 60 hours signal mode runtime (strobe-esque), and a really clean beam it cant be beat. oh...it's $12 !!!

great for BOB's and glove boxes
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"It is a far, far better thing that I do, than I have ever done; it is a far, far better rest that I go to than I have ever known" - A Tale of Two Cities - Charles Dickens