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jahmez · 3367 days ago · link · · parent · post: Batteriser is a $2.50 gadget that extends disposable battery life by 800 percent
I think the principle DOES work (its based on an old technique called a Joule Thief), however there are some prominent technical blogs that have run some of the numbers on their claims like giving you 8x battery life (it gives you more, but not much more, and also increases risk of battery leakage, etc). See Hackaday and Dave at EEV blog.