AA, AAA (keychain light), and CR123.

I don't run anything with C or D. Maybe a radio when I get one smile Did you know you can get converters though, to run 4 AA as a D and 4 AAA as a C. They are rectangles and you can get them at radio shack. They also have 'spacers' so you can run less power but still listen to the radio. Radio shack too.

-Todd
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