Replace the original charger for testing, or send it to the repair test to reactivate it, or replace the original battery. Mobile phone batteries are energy storage tools to provide power for mobile phones, mobile phone batteries are generally used lithium batteries and nickel-metal hydride batteries. \"mAh\" is a unit of battery capacity, and the Chinese name is milliampere-hour. 1, the mobile phone battery is composed of three parts: battery, protection circuit and shell. The current mobile phone battery is lithium-ion battery (non-standard occasions are often referred to as lithium battery), the positive electrode material is lithium cobalt acid. Standard discharge voltage 3.7V, charge cut-off voltage 4.2V, discharge cut-off voltage 2.75V. The unit of electricity is Wh(watt-hour), because the standard discharge voltage of the mobile phone battery is unified to 3.7V, it can also be replaced by mAh (milliampere hour). The conversion relationship between these two types of units on the mobile phone battery is: watt-hour = amp-hour ×3.7. 2, overcharge, overdischarge and short circuit will seriously damage the performance of the battery, and may lead to the risk of use. For this reason, mobile phone batteries generally have a thin protective circuit board to prevent these risks. 3, the charger is divided into direct and seat. Direct charging converts 220 AC mains into 5V DC, which is fed into the mobile phone and depressurised to the battery by the charging circuit of the mobile phone, and is generally distributed when the mobile phone is purchased. The charger is directly connected to the battery and converts the mains power to the required voltage for the battery. 4, if you want to use the charger, please try to choose the original or good quality products. If the charging circuit in the charger is of poor quality, there will be charging risk. 5, lithium-ion battery has no memory effect, but there is inertia, long-term no use may have passivation phenomenon, a few times can restore the best performance. 6, before charging, lithium batteries do not need special discharge. Some fast chargers, when the signal light changes, only means that it is 90% full, and the charger will automatically change to charge the battery at a slow speed. However, in general, as long as the display is full, it can be removed. 7, in order not to damage the battery life, it is best to charge slowly; The time need not be too long. 8, the mobile phone battery has self-discharge, because overdischarge will damage the battery, if the mobile phone battery is not used for a long time, it should be ensured that the battery has a certain amount of electricity. 9, although our mobile phone is within the network coverage area, but when the mobile phone is turned off and charged, the mobile phone can no longer accept and make calls. At this time, we can use the mobile phone's unconnected transfer function to transfer the mobile phone to the fixed phone around us to prevent the loss of calls, this method is also applicable to the mobile phone is not in the network coverage area or the signal is weak and temporarily unable to connect. 10, do not expose the battery to high temperature or cold, like the dog days, should not put the mobile phone in the car, under the sun exposure; Or take it to an air-conditioned room and put it in a place where the cold air blows directly. When charging, it is normal for the battery to be a little hot, but it cannot be subjected to the \"suffering\" of high temperature. To avoid this happening, it's best to charge at room temperature and don't cover anything on your phone. 11, charging is not the longer the better, the inferior battery without protection circuit should stop charging after full. If not used for a long time, the battery should be separated from the phone. 12, the newly purchased battery does not need to charge for 12 hours for the first time, but it is best to carry out 3 to 5 hours of full charging process, full charging is normal charging to 100%, full discharge is when the phone uses low power reminder. Because the battery has to go through the process of pouring electrolyte, formation, charge and discharge, capacitance and so on before leaving the factory, so that the battery is in an active state, but after leaving the factory, it takes at least one month or more than one year to reach the user's hand, due to the influence of the battery self-discharge, the battery material appears passivation, then through full charge and discharge, the battery can be activated. In the use of lithium batteries, it should be noted that after the battery is placed for a period of time, it enters a dormant state, at this time the capacity is lower than normal, and the use time is also shortened. However, lithium batteries are easy to activate, as long as 3-5 normal charge and discharge cycles can be activated to restore normal capacity. Due to the characteristics of the lithium battery itself, it has almost no memory effect. Therefore, the new lithium battery in the user's mobile phone does not require special methods and equipment during the activation process. Not only is this true in theory, but in my own practice, the \"natural activation\" method of charging from the beginning is the best.