So how do these work, then?

[Rockingit]

Curious about how these work - LED’s behind the knobs on my gas BBQ, except there’s no energy source apart from the passing LPG - anyone have an idea?

 

[Rockingit]

To be clear, there's piezo igniters on the burners but I can't see any ongoing source of current

 

[davesparks]

Magic, witchcraft

Or if they only light up when the burner is lit then it could be the little thermo-electric jobbies like you get in old swimming pool boilers that don't use a mains feed.

 

[UNG]

Probably the same way the bluetooth / RF units are powered on the remotely read water and gas meters

 

[snowhead]

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

 

[davesparks]

Thermoelectric-generator is the word I was looking for.

They are also used in those self-powered fans you sit on top of wood-burners

 

[DPG]

No batteries hidden anywhere?

 

[Avo Mk8]

No batteries hidden anywhere?

????

 

[James]

I bet there is a battery involved somewhere

 

[freddo]

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
View attachment 100968

So they hide a battery in there, that's cheating!

 

[ferg]

I'm going to go with Daves suggestion of magic or an imp on a treadmill inside the BBQ.

In the unlikely event that turns out not to be the case then a battery hidden somewhere.