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USB-C is supposed to negotiate a voltage and current that are safe for both ends of the connection as well as for the cable itself. A "shoddy" charger can supply too little power, but it's not going to overcharge a battery.



A shoddy charger can supply mains power to your device. Example [0].

[0] http://www.righto.com/2014/05/a-look-inside-ipad-chargers-pr...




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