The standard voltage of mobile phone lithium batteries is 3.6V, the charging limit voltage is 4.2V, and the maximum limit voltage of lithium batteries is 4.5V. Nowadays , the output voltage of many chargers exceeds 5V because the protection circuit of mobile phone lithium batteries limits the battery terminal voltage to 4.2V. When the battery terminal voltage reaches 4.2V , the protection circuit cuts off the charging circuit and the output voltage of the charger. is no longer available. The function, 5.3 V
or 5 V is not important. Generally, there is no problem under normal circumstances. However, if the protection circuit fails and is damaged, the charger's output voltage continues to be applied to the battery. When the voltage across the battery exceeds 4.5V, the battery will be damaged and may even become dangerous. Therefore, a better charger willSwitch the charger to constant voltage charging when the battery terminal voltage reaches 4.3V-4.4V. The charging voltage will be lower than 4.5V instead of higher than 5V, providing double protection . All chargers have the same interface, except for the manufacturer printed on the label, and can be mixed and charged. The USB voltage is 5V and will soon become the universal standard interface in China for all single-cell lithium batteries.
Not good. Since the charging voltage of lithium batteries is higher than the rated voltage, the voltage of a .V battery can generally reach .V when fully charged. This way the battery is 1.V when fully charged. Long-term use of 1V DC voltage to charge an 11.1V lithium battery will prevent the battery from working efficiently. And battery life is also affected.