18650 can the battery be charged with a mobile phone charger?

I haven't answered the question for a long time. Let me answer the landlord once in a while. I don't understand how the level of upstairs 12 is improved. The statement is completely wrong, there is nothing right at all! "Is the mobile phone charger 5 volts or 6 volts" is a power supply, not a charger, but only a part of the charger. I don't know how to answer the question "no 4.2 volts". If a long time ago, the mobile phone battery was a 3 series nickel battery, I have nothing to say. Now it is almost 100% lithium battery. Isn't the charging cut-off voltage of lithium battery 4.2 volts? (Maybe this brother is experienced in actual combat. Indeed, the power supply of the mobile phone is marked with 5V output. I speak bluntly and don't know how to turn it, please forgive me)

Anyway, the previous version of 18650 was 3.6V (including the previous lithium polymer battery), and now it is 3.7V. This voltage is actually the electromotive force of the battery, which is determined by the battery material. 18650 is actually a lithium battery. Now almost all mobile phone batteries are lithium polymer batteries. However, their charging cut-off voltages are the same, and they can be used interchangeably, so there is generally no big problem.

I want to know what your charger is like. If you use the original mobile phone charger, that's the best. Many forum players change their mobile phone chargers to 18650 chargers, among which Samsung charger is the most talked about (personal understanding only). If it is universal charging, it can actually be used, but it is not good for the battery. On the surface, the most direct thing is that the cut-off voltage is not accurate. In many cases, the cut-off voltage is too high, resulting in overcharge of the battery.