I'm guessing the has some sort of proprietary...
I'm guessing the has some sort of proprietary hook up to Petzl headlamps? Like, I couldn't hook this up to my BD xenon that takes 3 AAAs, right?
Well yeah, it's the shape of a Petzl headlamp. It wouldn't fit in a Black Diamond headlamp. And the charger won't work because AAA batteries are not charged by USB. This is a Petzl device.