Ive got these cheap, $4, crank lights laying around the house. i got them mostly for the kids to satisfy their desire for playing with flashlights w/o going through a bunch of batteries. But when I need them for finding stuff in the attic they are kinda worthless. I have to keep cranking every 10 seconds just to repower. The use of a good crank light would be just the schiznitz in an emergency situation. Is there a certain brand that is considered reliable and has endurance?