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Quick question about 16340's

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So, I plan on buying a 100mW 532nm laserbtb laser tomorrow. I need to sleep on it first :/

That being said, their HL unit takes 16340 batteries, not 18650's. I know mAh determines how long the battery can last and I so far have had no problem with my 3000mAh 18650 batteries but I see 16340's are around 300mAh-500mAh? What?

How long can I expect this to last? Only 300mAh seems very low :/

Edit: Seems there are some 700mAh ones too!

-Alex

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