Googled the cable for pics on the web, and it seems like the max output is 6.3w. Which means that at 9v usage, max current output is 700ma. Not too bad actually. In terms of practical use, most power banks come with 2 usb outputs, so with 2 cables, you can run 1400ma worth of pedals I believe. In an even more extreme scenario, you should be able to use a USB hub and run 4 cables concurrently.
Hope I understood this correctly.
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