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Lithium / Li-Ion Flashlights

Lithium and Li-ion flashlights are typically brighter and have longer runtimes. A flashlight with a single CR123A is the equivalent of a flashlight with two AAA / AA batteries and can get longer run times. A single RCR123A (16340) will beat three AAA / AA on runtime with a similar output. 18650 batteries have become the standard in quality LED flashlights for the best outputs and runtimes.