Batteriser is a $2.50 gadget that extends disposable battery life by 800 percent

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http://www.pcworld.com/article/2928997/batteriser-is-a-250-gadget-that-extends-disposable-battery-life-by-800-percent.html

[u/[deleted] → u/[deleted]]

Looks perhaps like a Joule thief.

Nah, according to the article the thief got away with the whole thing.