According to Zeroair 3.9 mm. And that’s a lot for me.
Especially that they did it for a wrong reason. LED overheating? There’s probably something wrong with thermal transfer rather than mass.
This not particularly bright light probably has a shelf like Emisar D4 and much fatter than FW3A.
It hurts especially because they did quite a few things right with V1. Very few AAA lights have e-switches and this is the only one with tail e-switch.
They made the only 10440 with built-in charging. And capacity is not that far off regular 10440 (as long as it actually meets its rating).
Unibody? Great!
Compactness? Not class-leading but very good.
Looks? Nice.
With a few improvements it could be a truly awesome light. But for me they moved closer to mediocricity than to excellence.