Does anyone know what kind of battery they use in these watches, and how are they replaceable ?


https://canyon.eu/product/cns-sb41br/

They're designed as rechargeable Margaret.

If the battery has died, I'd suggest that it's not a DIY replacement. I say that because the watch is sealed from water ingress. It'll also likely require special tools to open it without damaging it.

Main agent job? Trusted local repair shop?

I recently bought one Rebbonk.
It is working fine but only one year warranty.
I realised afterwards that it is a sealed unit as it is waterproof. So if it packs up, I doubt if I will find a local repair shop unless I ask Timpsons if they repair such things. Would it be a lithium battery, as I am worried about it against my skin when I wear it? I would only wear it for walking to measure how many miles I walked. My friend has a pedometer and we walked 5 miles last week, but my feet were complaining afterwards, so a lovely footpath when I got home relieved the tiring aches. We did 3 miles on Monday, which is far more comfortable a distance without getting worn out.
Out of interest, walking to Asda there and back is 2 miles.

I'd think it would be a Lithium-Ion battery.

It should last for a long time as long as you follow the instructions about basic battery care.