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USB battery pack can also be used if combined with a DC converter to boost voltage from 5 volts to the fan's required 12 volts.

Courtesy of the McGyver PPE team,

See commends by Howard Chong below for parts and links.

Pass through charging may not be possible for most USB battery packs. If this route is taken, obtain three packs. One in use, one fully charge, one being charge.

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