Coin cell batteries are the bane of my existence. All the temperature sensor I have are all coin cell's. Every year I have to replace them and throw them out instead of using rechargeable batteries that you can reuse, so annoying.

I never knew Ikea had temperature sensors, might replace my current ones with Ikea even if they don't use Zigbee. AAA batteries are great!

I have them and don't really like them (I assume you mean the Thread ones). Battery life is mediocre, worse than coin cell operated Sonoff Zigbee one I have, accuracy is good, but you can't set update rate or threshold or any generally advanced feature.

Sometimes they either stop updating or drop off the network permanently.

I wouldn't really trust them for anything even remotely important.

Shame since they're pretty cheap, perhaps they'll fix the firmware and then they'll be excellent.

Ikea stopped with the Zigbee sensors I think? It is all Matter now?

I really don't get this meme. AAA batteries are terrible for most (not all) sensors because it makes the sensors enormous. Like the newer door/window contact sensors. Coin cells aren't expensive, which people often claim. Maybe if you buy them 1 by 1 at the grocery store. If you get the right sensors, battery life can be 2-3 years.

Like, IKEA's Zigbee water leak sensor (BADRING?) with 2 AAAs (1.2V; they don't like 1.5V) has a battery life of 9-12 months. My Aqara water leak sensors (CR2032) have been going strong for at least 3 years. They predate me starting to track it with Battery Notes and that has to be 3 years ago (and yeah I test their functionality every 6 months or so).

I think IKEA has discontinued its Zigbee sensors. The new ones are Matter.