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Also, (not to hijack this thread) but is there any meaningful difference between 3.0V, 3.2V, or 3.7V? The 3rd one, when used with 2 batteries, increases the total voltage by 1.4V. Couldn't that harm a laser?
Am not sure this was adequately answered. Yes there is a big difference between them. Always use the correct battery, and never use 2 batteries in a laser that is supposed to take only one, at least several people here when they were new and didn't know any better have killed a laser by using two 16340 instead of one 18650. Every laser has a driver that works within a certain voltage range, most lasers run on 1 or 2 of the 3.7V rechargeables, I have only seen one or two that use the 3V.
I'm new here, do I don't know a ton about batteries. I see a few people that seem to like Efest 16340s, but other people shoot them down. How do they compare to brands like AW, Panasonic, or Fenix?
I believe they are mid range battery and members seem to favor the smaller 10440 ones. It could be also because efest are the only brand they can find at that size.
Yes Efest are a mid range battery, if you want cheaper batteries buy Efest instead of the blue or fire batteries they are ok. The 10440 are available in other brands including Trustfire and Soshine and I think something else, but Efest has a high drain IMR10440 that can put out 3A (for a few minutes) so it's possible to power quite a powerful laser with such a small battery. Those Li-Mn batteries can handle more current than the Li-Ion can but they have a lower capacity in mAh than Li-Ion, some of the Li-Ion don't hold up well at a high current.
Alan