I attempted to standardize my LED lanterns, weather radio, and task lights to NiMH re chargable AA cells (Eneloop) after the 2004 hurricane season...I still have the 2D LED MagLights in the house and car for their for their long run time, but way to heavy for EDC...my keychain light is a Fenix E05 three level AAA Eneloop powered, and I slip a Solar Force Z2 into my pocket for storm season... and typically a Solar Force L2 18650 in the pocket of my GoreTex jacket