Well, well, thanks for the education.

However, my comments stand for they what they are - and that is - many cell phone charging, or maybe only "some" cell phone charging systems will cut voltage to the battery through a circuit, which I assume makes "plug and bump useless."

I will heed your expert directive and investigate whatever bump charging means to cell phone users. I can state with some authority it will not work on the several models of Samsung and LG phones I own. But I also admit I own cheaper models of phones, much different from yours.