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For me they usually just lose capacity and/or ability to charge. Most laptops will keep functioning when tethered.

I think most batteries must puncture or corrode to pose a physical hazard. Alkaline batteries can corrode, but I’ve never seen issues with old Li-Ion unless exposed to violence and/or water.

EDIT:

Some numbers found quickly: https://www.britsafe.org/safety-management/2024/lithium-ion-...