A 10-Year Battery for AirTag

At 10 years I kinda wonder what the odds your AA batteries become problem occasionally (leaking, etc) long before the Airtag... although they are Lithium batteries.

are lithium batteries known to expand or catch fire in the AA form factor?

I believe that is primarily an issue for damaged or rechargeable lithium batteries, so not really a concern here.

I think leaking is relatively rare, but based on my experience of "10 year" smoke detector batteries they usually don't last anywhere near that.

Also there's stupid legislation in the UK at least around making smoke detectors with replaceable batteries. Took me quite a while to find some.

I think you misunderstood GP. Lithium AA batteries are very reliable and keep charge for at least ten years (the standard metric is losing approximately 1% per year), that's what he's saying.

They won't burn because they contain metallic lithium (and not lithium salts like rechargeable cells) and don't contain easily flammable organic solvents (yep, like rechargeable cells). There are videos on YouTube of people disassembling them with no problems (for example, to extract metallic lithium for chemistry experiments).

it's a sincere and earnest question - I didn't know. I appreciate the additional info.