It is OK to tell you that it is generally not recommended to use universal charging because many universal charging appliances do not have the voltage debugging function. The output stable voltage has been maintained at 5V mobile phone battery. The maximum voltage is generally 4.3V mobile phone battery. Charging in the case of damage will lead to saturation of battery power and the charger will force the battery to charge When the battery reaches the collector limit, it will stop charging the battery. This process will have the effect of weakening the battery's ability to collect electricity, which is called battery non-retention