Vzhledem k tomu, že USB-C port je input/output, jak bude powerbanka vědět, že se má nabíjet z připojeného zařízení nebo že má připojené zařízení nabíjet? Jinými slovy, co se stane, když přes USB-C propojím dvě tyto powerbanky nebo k powerbance připojím nějaké zařízení, které lze nabíjet ale i jako zdroj energie? Jak určím, kterým směrem má téct proud?
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