How often have you had to search endlessly for batteries when your flashlight unexpectedly died? Instructables user shahrokhani found the solution to this common dilemma by making his own powerful ...
Megan Treacy is a writer from Austin, TX. A former editor at EcoGeek, she worked as a technology columnist for Treehugger from 2012 to 2018. The power cell is your flashlight's main source of energy.
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