least, not at
Oh, it boiled off! Damned fast too! And no, you wouldn't fit into the 18" vacuum jar this was in.
The way to get ni-cad to boil at room temperature is simply reduce the pressure to something significantly below its vapor pressure. We did it knowingly with gold too once, and that was nothing short of beautiful as far as the results went. The entire inside of the bell jar was very faintly plated with gold. That particular experiment was testing the voltage breakdown of ceramic wafers, so in addition to the gold plating there was the bluish white glow from a high voltage arc too. Really great visual effects!
That was 40 years ago...