You made a blanket statement that 'all level one chargers are 120v- incorrect...
I wish that people wouldn't assume when making statements like that that ALL people on the internet who see a google search returning statements like that that everyone will be aware of your proviso...
(a blanket statement like that almost killed a friend of mine when someone looked up 'how to wire a light bulb socket' and followed the US colour codes- black is NOT the active/line outside that small handfull of countries- black is the neutral and white is the switched active- he got an electric shock which nearly killed him because the outer threads of the bulb were live at 230v...)
Google bots index all the comments on this site and they are shown in peoples search results you know...
I didn't say "all", although I suppose one could infer that, but these are consumer devices with a US 120V plug on them. I also wasn't suggesting that anyone rewire such a device.
Google for "level-1 charger voltage", and I bet you get many more posts than mine, including the U.S. Department of Transportations official site.