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Worldbuilding

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    $\begingroup$ I have a hard time believing this answer. If what you say is true, you could not use a dumb power bank to charge an S7, or a cheap old USB charger. Are you sure you don't mean that you can't charge fast without negotiating? $\endgroup$ Commented Oct 21, 2019 at 19:53
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    $\begingroup$ I have a "dumb" charger I've installed in my car. Even fully powered off, both of those devices will not charge, and will actually slowly discharge, when plugged in. That's also with the apple 3 style resistor network or the data lines shorted together $\endgroup$ Commented Oct 21, 2019 at 20:08
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    $\begingroup$ Yeah I don't buy this. I saw countless S7 phones charge with generic chargers. Sure, they'll try to negotiate a fast charge over the data lines, but if nothing is responding there, they'll happily charge at 5V. $\endgroup$ Commented Oct 22, 2019 at 3:22
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    $\begingroup$ My Samsung Galaxy S7 will charge on any dumb powerbank or plug charger with just the power lines connected, limiting itself to 500mA of charge current. Your observation sounds more like a problem of the charger itself. The only thing I've found that several manufacturers will not allow is bringing a fully-discharged (read auto-poweroff by lack of battery) phone back on without the original charger. This bit me with a Nokia Lumia and an older Sony more than once. $\endgroup$ Commented Oct 22, 2019 at 14:16
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    $\begingroup$ You short the 2 data lines together and it will charge in dumb mode. $\endgroup$ Commented Oct 22, 2019 at 20:24