[tescocles]

Is there any mention of what kind of radioactive decay this is powered from? Based on the name, one might assume beta? This would also track with the "research done in the 20th Century" bit considering beta radiation is just electrons.

My point being - what impact does this have on the safety of the device? Any more than certain light sources containing mercury, for example.

[anfractuosity]

Not sure about this particular device, but https://citylabs.net/technology-overview/ apparently makes use of tritium, which is betavoltaic based.

Just noticed for citylabs it says - "Base price starts at $5,250 per battery"

I'm curious what they'd be used for considering the very low power output and cost.