Android phone slowly charging message

Question

I purchased a TCL 10L phone two days ago. To my surprise when I plugged it, the phone said "Fast Charging" and it charged very fast. People on YouTube say that it does not support fast charging. Anyway, on next day, when I emptied the battery, I plugged the charger in. It said something like slowly charging. I panicked and I removed the plug and plugged it back in. It said fast charging like the first time and is currently charging.


I am worried. Is the device displaying the slowly charging message normal? I have 1 day left to replace the device if there are any issues. Though, I am not sure if this is normal or not. The device does not have any faults so far. So, I would risk getting a new device with the same issue and more issues. The port is USB-C if that matters.


Regards and thanks.


Edit: I unplugged the charger at 97%. Then, replugged it. Now, it says "Charging" only. I tried unplugging/replugging two times and still "Charging" no more fast charging at 97%.


— jamana | Sources

Answer

"Slow charging" usually means that the phone wasn't able to confirm that the power source is capable of providing more voltage than the original USB spec allows. This usually happens when the phone is connected to a computer or the cable didn't go all the way in and USB data lines don't contact well. If it doesn't happen too often then it's normal.


— gronostaj | Sources

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