Mine has one of the two velcro straps on the battery coming off the battery and I need to reglue it. But, when it was right, put in on the top tube when running on the bars or the seat tube when putting it on my helmet. I have a splitter so it also powers a tail light I have mounted on my seatpost.
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Bikes: 1996 Eddy Merckx Titanium EX, 1989/90 Colnago Super(issimo?) Piu(?), 1990 Concorde Aquila(hit by car while riding), others in build queue "when I get the time"