A Redmi Note 7S owner has reported a fault with his device that he believes caused it to explode. The user claimed that the smartphone was treated in a normal manner and wasn't even charging when it caught on fire. However, after a thorough examination of the melted handset, Xiaomi has concluded it was caused by "customer induced damage".
https://www.notebookcheck.net/Xiaomi-Redmi-Note-7S-goes-up-in-flames-but-manufacturer-attributes-it-to-customer-induced-damage.443895.0.html