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The trick of buying Ultrafire and other cheap Li-ion batteries is knowing what you're getting. Even with the significantly lower capacity and low current (this laser only needs a quarter of an amp), they can still be good value from my experience, as you can get them dirt cheap.
Reminded me of this https://www.youtube.com/watch?v=EwVDDxoKBk4
I love your video, you've done a great job with it
Build Your Own Essential Oil Extractor Distiller
I feel like Jean-Baptiste Grenouille...
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