"Actually, most phones now have built-in non-removable batteries. An original battery wouldn't generally have this issue. Sir, you probably bought a battery online and replaced it yourself."
The clerk smiled and explained, "However, there are many reasons why a battery might bloat.
For example, charging for long periods without unplugging the charger; using different charger models to charge multiple times; frequently plugging and unplugging the charger irregularly; unstable charging voltage; differences between domestic and international standards; two or more chargers working at the same time; using both direct current and alternating current; using other auxiliary cooling devices while charging, causing extreme instability in the battery; the last reason is the port burning and blackening due to high charging frequency."
The clerk concluded, "Overall, these are probably the reasons... Sir, why does your face have a few marks on it?"
