Saw your post on Farriders Diesel.
After many months of researching all the options...hard wired verses battery powered, I went with this option.
Hard wired to the bike.
https://www.tourmaster.com/xcart/product.php?productid=360&cat=59The battery option appealed to me as the first option as not being mechanically/electrically minded I didn't want to bother with having to wire the bike or get it wired.
However with the battery option I strongly doubted the life of the battery before having to charge it. The problem was when I was buying it I was doing and planning loooong rides of riding thru the night so batteries then didn't seem so attractive. How many would I have to carry to get me thru a 24hr ride etc... then when could I charge them if I was doing a 50CC in ALL cold weather when I'd need the vest on day and night.
Note to self, always unplug when walking from the bike....
So, as for the wiring, one connection directly off the battery with the lead stuffed under the seat in summer. Pull enough of it out from under the seat at the front left side to expose the connector and Bob's your Aunt Canny's Fat.
So it comes down to how your gonna use it I guess. Loooong ride, go hard wired. For use at the football as well, go battery.
Hope it helps!