Mobile phone chargers generally produce two wires, red is the positive pole and black is the negative pole. Just connect the battery directly. Generally, the lithium battery charging voltage is 5V to 5.5V and the charging current is 0.5A to 1A. You can check the parameters marked on the charger to easily check whether the battery is full. or not, you can also check the charger and an ammeter connected in series between the batteries. If the current is less than 10mA, it means the battery is fully charged. Also, the 4.2V voltage you mentioned is the voltage when the battery is fully charged. Due to the protective effect of the protection plate, charging is not possible at the moment. The battery you mentioned is around 2.8V to 3.2V. the battery is low voltage.
The battery can only be charged 300 to 500 timesbefore needing to be replaced. Correct Statement: The lifespan of a lithium battery is related to the number of charging cycles completed and has no direct relationship with the number of charging cycles. A charge cycle means that all of the battery's energy is used from full to empty, then charged from empty to full. This is not the same as a single charge.
To extend battery life, pay attention to the following three aspects
1 The temperature should not be too high
If the temperature is higher. above the specified operating temperature, i.e. 35°C. If lithium batteries are used in the above environment, the battery power will continue to decrease, that is, the battery power duration will not be as long as usual. If the device is charged at such temperatures, the damage to the battery will be greater. Even the storagee batteries in a hot environment will inevitably lead to corresponding damage to the quality of the battery. Therefore, trying to maintain a proper operating temperature is a good way to extend the life of lithium batteries.
2. It is not good if the temperature is too low
If you use lithium batteries in a low temperature environment, i.e. below 4°C, you will also find that battery life is reduced. Some mobile phones original lithium batteries cannot be charged even in low temperature environments. But don't worry too much, this is just a temporary situation, different from using in high temperature environments. Once the temperature rises and the battery molecules are heated, the battery immediately returns to its previous capacity.
3. Life residesin motion
If you want to maximize the performance of a lithium-ion battery, you need to use it frequently to keep the lithium battery's electrons in optimal condition. fluid state. If you do not use lithium batteries frequently, remember to cycle the lithium battery every month and perform power calibration, that is, deep discharge and a deep load.