Rename the terms?
He could call himself an "electronics engineer" to avoid the restriction. He's not doing power distribution or generation, but small low voltage devices.
Sure, he could start a thousands of fires with unsafe use of Lithium Ion batteries. It couldn't be any worse than all of the junk on Amazon, eBay, and Baidu originating from anonymous white-label producers. Those three companies would blink out of existence if they could only sell devices from licensed Engineers.