Maglite.com thank me later
I second the Maglite, the ML25 fitted with AA to C-cell adapters running Eneloop AA battery's.
I ran this setup In my truck through summer and winter for a few years checking the state of the battery's once a year, I've since upgraded to the ML50L It's brighter and has better run times...still using the same AA and adapter set up and It still fits In the center console of my truck.