maybe it went into auto shutoff and showed the blue light as a feature to tell me the battery life ?
This is in on the website (the manual);
Explanations of the battery display
following switch off:
Steady blue light: the battery is be-
tween 64 and 100% charged.
Blue, slow-flashing: the battery is
between 32 and 63% charged.
Blue, rapidly flashing: the battery is
between 1 and 31% charged.
Blue flashing: the battery is com-
pletely discharged.
So, yes, maybe at time-out it tells you state of charge?
Oh, yeah, then there's this;
6.8 Automatic Switching Off
i To conserve battery capacity, the
Vaporizer will turn off automati-
cally two minutes after the last key
press or usage.
The shutdown is
confirmed by a vibration and dis-
play of the charge level.
i The automatic switch off can
be reset to two minutes by brief-
ly pressing the ON/OFF switch