This one kept me going for 24 hours.. We were at a friend’s for dinner and she lit the candle at which point the LEDS lit up and stayed lit up all the time the candle was on (several hours). I was convinced there had to be a trick like a battery – but no – looks like no battery – no hole in the bottom.
The candle comes surrounded by gel within which are the copper-wire LEDs. They glow brightly. It seems the trick is some kind of bimetal strip, generating electricity from temperature difference between the candle and the edge of the glass. There’s no reason why this should not continue to work for years. And that’s it for Christmas day – nothing else exciting.
Update: I got it wrong – and thanks to reader Michael Mauch for the correction. It seems the device DOES use a non-replaceable CR203 battery (Michael’s M&S link). I’m disappointed.
Interesting if it was there for the application (LED candles) as candles lose more energy in terms of heat than they do in terms of light.
In fact its better to imagine a candles light output as secondary to its heat output!
I looked up these sometime ago as I witnessed a few things I was convinced must be heat driven. Likely like you mate I was probably wrong and there was a coin/cell battery somewhere.
Seebeck generators or thermoelectric devices they are commonly known as and are widely available even on amazon believe it or not!
It seems it has a CR2032 (and an IR sensor):
https://www.marksandspencer.com/neroli-lime-and-basil-light-up-candle/p/hbp60499788?color=GOLDMIX
Apparently it also has a monofilament:
But someone on Youtube replaced the candle part without the monofilament: https://www.youtube.com/watch?v=AOrM7Q1wfo0
Merry Christmas!