Initially that was my concern before getting the phone. But then I think we all miss out something. I also found out that the battery they use isn't typical li ion battery. But graphene. So that helps in certain way. No idea why not many reviewer mention about this. Only keep mention about the 120w charging
Saw your post and look up on graphene batteries and it seems safer than normal li ion batteries.. as per gsmarena "The Xiaomi Mi 10 Ultra is powered by a graphene-enhanced Li-Ion battery with a capacity of 4,500 mAh"
https://www.androidauthority.com/graphene-batteries-explained-1070096/
just something new i guess
"Finally, graphene is safer. While lithium-ion batteries have a very good safety record, there have been a few major incidents involving faulty products. Overheating, overcharging, and puncturing can cause runaway chemical imbalances in li-ion batteries that result in fire. Graphene is much more stable, flexible, and stronger, and is more resilient to such issues."