There was a story about a man who had a 18650 li-ion battery explode on WFAA last night. It should serve as a warning you all of us to not buy recycled laptop batteries for our lights. As a general rule, stay away from any battery that has the name "FIRE" in it as most are not OEM batteries.

http://www.wfaa.com/story/money/consumer...ttery/70191786/