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Smatree Power Bank Charger
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<blockquote data-quote="Virtual1" data-source="post: 21821" data-attributes="member: 4084"><p>Yep, FWIW there's a thing called a "boost regulator" that can take any small voltage high current and transform it into a higher voltage, lower current delivery. The smallest USB power banks contain just a single 3.7v 18630 lipo and have to boost that to produce the 5v for the USB as well. Any of the larger power banks use many 18650's in series for 14-18v total, and have to boost to charge off USB as they normally do. (they <em>buck</em> down from 15v or whatever to run the 5v to your peripherals in a way that is <strong>much</strong> more efficient than the previous generation "linear regulators")</p><p></p><p>And those are some scary reviews... one claiming of have seen fire and showing a melted case, and another <em>actual video</em> of the magic smoke escaping. thankyouno</p></blockquote><p></p>
[QUOTE="Virtual1, post: 21821, member: 4084"] Yep, FWIW there's a thing called a "boost regulator" that can take any small voltage high current and transform it into a higher voltage, lower current delivery. The smallest USB power banks contain just a single 3.7v 18630 lipo and have to boost that to produce the 5v for the USB as well. Any of the larger power banks use many 18650's in series for 14-18v total, and have to boost to charge off USB as they normally do. (they [I]buck[/I] down from 15v or whatever to run the 5v to your peripherals in a way that is [B]much[/B] more efficient than the previous generation "linear regulators") And those are some scary reviews... one claiming of have seen fire and showing a melted case, and another [I]actual video[/I] of the magic smoke escaping. thankyouno [/QUOTE]
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Smatree Power Bank Charger