I have found in the past its very handy to have a 12v accessory plug on your motorcycle. I use it to charge the phone, run the gps, plug in the heated vest. and when back home put the battery tender on it. when I had the headlight bezel off to wire the heated grips I looked around to find some free real-estate to locate a receptacle , there was a spot on the left side of the bezel just above the directional light, drilled a hole, and I wired it into the always on spare wire back there. I've since used it on a few trips and it works great. By the way they make many adapters for these Hella plugs including USB charger, I have a LED drop light attachment for camping setup, or night time repairs. Got them all on Amazon.
CLOSE UP VIEW

A LITTLE FURTHER BACK WITH BATTERY TENDER PLUGGED IN

Could u give the exact search criteria I need fer Amazon? I bought one from Adventure Spec, but it turned out to be some weenie Euro sized outlet plug. Weaksauce.