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This question already has an answer here:

I am trying to find any way in which I can have a higher power output from a USB power bank, by combining multiple USB ports in parallel. The USB power bank has 3 outputs, one rated at 2.1A and the other two rated at 1A. How do I do this exactly?

One idea would be to use a splitter cable and then combining multiple ports to one, but how would the power be distributed across the wires? I don't think a thin USB power wire is able to handle > 4 amps. Any solution to resolve this issue?

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marked as duplicate by SamGibson, JRE, Chris Stratton, Turbo J, duskwuff Aug 4 '18 at 4:33

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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    \$\begingroup\$ Give us more information about what you'd actually like to accomplish if you can. Using multiple USB ports of a computer in the way you're describing could be disastrous. For USB chargers, you would have to look at the design of the individual driver to evaluate how it will share a load. Do you simply want 4 amps available at 5 volts for some external device? \$\endgroup\$ – K H Aug 3 '18 at 5:13
  • \$\begingroup\$ Yes, it is drawn from a powerbank \$\endgroup\$ – nano Aug 3 '18 at 10:27
  • \$\begingroup\$ Didn't you already ask this question a few days ago? I remember a question with the exact same configuration (USB power bank, one 2.1A port, two 1A ports, requirement for > 4A) and I thought it got answers. Was there a problem with those previous replies? Why repeat the question? \$\endgroup\$ – SamGibson Aug 3 '18 at 11:40
  • \$\begingroup\$ Found it - same user name, but different account: "Higher current draw from powerbank?". Please, don't repeat questions. If you need additional clarification, then ask for that in the original question, so that we can see the history and context, and we don't waste time starting from the beginning again. \$\endgroup\$ – SamGibson Aug 3 '18 at 11:49
  • \$\begingroup\$ Can a y splitter be used for parallel connecting the usb cable \$\endgroup\$ – nano Aug 3 '18 at 13:47
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The answer depends on powerbank construction. This teardown video of Anker 20100 powerbank (two outputs) indicates that one can draw 4 A by using two ports in parallel, around 10:00.

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