Petzl
Rallonge R1
The Petzl Nao kit includes an extension cable and a belt clip that allows you to attach the battery of the Petzl Nao headlamp to your belt or inside your bag. This way, you reduce the weight of the headlamp on your head by 131 grams.
In winter, this system helps slow down the battery discharge due to the cold.
Key features of the Petzl extension cable