Bahh, my Duxo XB has been lost due to a country road bump, leaving only the backplate*, although possibly partly my fault, maybe I dislodged a clip adjusting it for a night ride, which it survived.
*The battery containing main body detaches from this plate to access/replace battery cells: this seems not the most obvious design so its replacement will be gaining additional stick on velcro reinforcement (I rely on another BS reflector for legality).