I use a two "C" cell maglite five or six hours a week and was getting bummed buying alkalines - I found plastic sleeve adapters for AA's to work in place of C's and nabbed one of the $9 LED modules just as you, found at HD, and used the new-style NiMH with no self-discharge and have been loving the new flashlight.
Only hitch is cold batteries dim pretty fast - but the light weight and 15 minute recharge are great! I'm looking now for a three cell "D" battery maglite to convert also for cold weather use...