Can the Ultrafire C3, 1 or 2 AA LED flashlight use Li-ion 18650 batteries???
Li-Ions are not a force to reckon with, they are only designed to be used in devices that can automatically shut off at critically low voltages at peak load and have to be charged in a smart charger (reverse bias feedback controlled charge) in simpler terms in a relatively simple piece of electronics like this a dead battery means exactly that a totally unchargable dead battery, also they also leds are very forward bias sensitive and because the battery your mentioning is a 3V cell 2 of them would most like be well over 2 volts over Max forward bias (maximum forward voltage before your led either explodes or burns out and I have had them explode before) also from the looks of them they are a little thicker then n cells and shorter then AA cells so they wouldn’t even fit the flashlights casing.
L2 defender, CREE R2 led Ultrafire
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