While running on highest mode for runtime measurement (will follow in the next days) the sticker around the charging port came loose:
This looks ugly, and it was very easy then to remove it completely. Seems that the adhesive used is not strong enough if heat (while running on highest modes) is applied.
I also saw in the user manual that this headlamp is rated for IP 66, not 68! (there is explicitely mentioned “not for diving”) - so it should not submerged. I am not sure why, maybe this is due to the design of the gesture sensors?