For over a decade, I had a 5C Maglite in my car for light and protection in case anyone in a really bad neighborhood tried to drag me from my car. Well, the light would come with me. Thankfully, that never happened.
Earlier this year, I checked the light and though it still worked, one of the cells leaked and I beat the cr@p out of the light to remove the offending cell. I can't believe it still works.
Now, I just carry a 2-CR123 3 watt MXDL V along with a new Dorcy AAA on my keychain. I may also carry a decent 2AA light ... one of the multi-LED lights from DAE. I'll change the cells every other year to avoid leaks.
I have a hard time shelling out for lithium AAs.