Nuclear batteries have their place, but consumer products are not it.
First, you can’t switch them off, so they are either always warm or the are trickle-charging another storage system (batteries, capacitors, whatever) within the device.
Second, the radiation. You can do various things to limit the risk, but the LD50 is something like 0.25 watts of absorbed ionising radiation sustained for 18 minutes, so damage to the batteries (malicious or accidental) would have significantly greater harms than, say, asbestos, CFCs, or domestic carbon monoxide sources.
You absolutely do not want a 10 watt lightbulb powered by built-in atomic batteries anywhere it can get messed with, let alone a 2 kW kettle or a 5 kW oven.
First, you can’t switch them off, so they are either always warm or the are trickle-charging another storage system (batteries, capacitors, whatever) within the device.
Second, the radiation. You can do various things to limit the risk, but the LD50 is something like 0.25 watts of absorbed ionising radiation sustained for 18 minutes, so damage to the batteries (malicious or accidental) would have significantly greater harms than, say, asbestos, CFCs, or domestic carbon monoxide sources.
You absolutely do not want a 10 watt lightbulb powered by built-in atomic batteries anywhere it can get messed with, let alone a 2 kW kettle or a 5 kW oven.
https://en.wikipedia.org/wiki/Acute_radiation_syndrome