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/i/388921/products/2020-10-02T18%3A09%3A49.990Z-4.jpg?1606306133 "18650 Li-Ion prototyping battery from dadantech on Tindie")
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Amazon.com: Adjustable Current LED Driver, DC 3.3V 3.7V 5V LED Driver 30-1500mA Constant Current Adjustable Module for LED 18650 Li-ion : Industrial & Scientific
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Rechargeable LED Flashlight Using PVC Pipe : 11 Steps (with Pictures) - Instructables
