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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/gra...ained-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."
Yes they are using graphene. Thats why they can still maintain 90 percent capacity after 800 charging cycles