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Sanwu Blue Laser - Silver Series Batteries?

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I ordered a Sanwu Silver 3W and they do not include batteries.
Their site, https://www.sanwulasers.org/product/silver says.......

Double protected Flat top 2*18650 / 2*18350(not included)


Does it have to be flat top? I want to use 18650's but I don't know which brand.
Orbtronic has a ton of choices on Amazon...

What is "double" protected mean anyways? I know they have 'circuits' that protect them....

Thanks. Cheers.

:angel:

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