Adaptor to charge a laptop from a powerbank?

  AmrBadawy 11:10 11 Dec 2016

I have a 20,000Mah powerbank, which has 2.1A output and i was wondering if there is any sort of adaptor that goes from USB to laptop charging ports. Ive seen this come with certain powerbanks but can't seem to find a standalone option

  AmrBadawy 11:51 11 Dec 2016

I can't find any with a transformer to step up the voltage, my powerbank is 5v so i assume it needs to be stepped up to 12 or 19

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