Originally Posted by
VegasTriker
Your best bet is to spring for buying a quality brand name battery rather than trusting the fictional ratings assigned to a lot of the bargain basement Chinese brands like Trustfire and Ultrafire. If you read the recommendations on flashlight websites a couple of brands come up frequently. The one I chose is NCR/Panasonic 18650b which are available on eBay reasonably priced.
Yes, avoid anything with "fire" in the name because fire is a bad thing wrt batteries. Panasonics from a reputable seller are a good choice.