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Xu-haoTruong It's explained poorly, with some calculations it logical. 500mAh @ 12.8V (equivalent to 2,000 mAh @ 3.7V power bank). There you have it. The compressor is 12v and the USB output is 3,7v, that's why.

2018-02-25 11:53:22 Helpful (0)
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