What are the battery safety warnings for the Amazfit GTS 3?

The device has a built-in battery that cannot be removed or replaced — do not disassemble or modify the battery yourself. Disposing of the battery into fire, mechanically crushing it, or exposing it to extremely high temperatures can result in an explosion or leakage of flammable liquid or gas. A battery subjected to extremely low air pressure may also result in an explosion. (Page 17)