I have one. I use it for several things. One is to charge the battery with, through the bikes power socket. I also have another adapter that plugs into this one that lets me connect any cigarette (American) lighter adapter. Which I use for charging my cell phone or blowing up the air mattress when camping.

Tom

Those who would give up essential liberty to purchase a little temporary safety deserve neither liberty nor safety. Benjamin Franklin, US author, diplomat, inventor, physicist, politician, & printer (1706 - 1790)