I have gone over to a hub dynamo driven light set, wired taillight.
All I have to do is switch the headlight on, and ride.
can even just leave it on since no battery to drain, stand-light in circuit
is just a capacitor..

battery light for headlight? be seen 0.5w, see by, Dark road, 1 or 2w.
they usually do come with QR handlebar clips.