Misunderstanding of mobile phone charging

Misunderstanding of mobile phone charging            A lot of friends think that the first three times that the new mobile phone just bought back should be charged for more than 12 hours, so as to maximize the battery life. In fact, this concept is out of date. The so-called 12 hour rechargeable battery is for NiMH batteries, while most smartphones on the market currently use lithium batteries. Lithium battery doesn't need to be activated or use memory function, so it can be charged and used at any time, not as much as NiMH battery.            If you want your smartphone to maintain its original endurance, you can charge it as follows:            1. The first three times of the new mobile phone can use the low power alarm, use the original direct charging to fully charge the mobile phone when it is turned on, and then charge for an extra hour, which is recommended considering the charging control error, and does not need to charge for 12 hours.            2. Many people like to charge their cell phones before they go to bed. In fact, this will lead to long charging time and damage to the cell phone battery. In addition, the nighttime voltage is high and fluctuates greatly in many areas, which has no positive effect on the maintenance of battery life.            3. At present, the general smart phones on the market can be charged, used and stopped at any time. Don't wait for the phone to completely power off automatically before charging, so the damage to the battery is also very big. After the battery is fully charged, the battery can be charged for 15-30 minutes, which is useless.            In fact, at present, all smart phones use lithium batteries, which are not as fragile as you think. When the mobile phone battery is full, it will automatically cut off the charging power and avoid overload overcharge, so you don't need to worry about causing damage to the mobile phone battery, and you don't need to get up and unplug the power in the middle of the night, so users can have a good sleep!            Of course, it should be noted here that the mobile phone charger used must be a regular charger, preferably the original charger. Some fake or mismatched chargers are better not to be used to charge mobile phones at night to prevent poor quality of chargers, which may cause the chargers to burn down and damage mobile phones.            Lu Jianguo, director of the comprehensive inspection department of the national household appliances quality supervision and inspection center of China Household Appliances Research Institute, told life times that different battery products need different methods of charging and must be used according to the product instructions. Early nickel cadmium and nickel hydrogen batteries required similar "activation.". These batteries will produce a "memory effect", charging in the state of incomplete discharge, which is easy to overcharge the battery, and users will feel that the electricity will soon run out after a long time. However, most of the batteries used in mobile phones and laptops are lithium-ion batteries. Its initialization process has been completed at manufacture time, so it does not need to be activated at the beginning of use.            Generally, the life span of lithium-ion battery can reach hundreds of charge discharge cycles. The charge discharge cycle here refers to the process of recharging after the electricity is used up, rather than plugging in the charger and unplugging it once. Lithium battery has no memory effect and can be charged at any time. In order to reduce the number of charges, the battery is deliberately used up and refilled, which does not extend the battery life, but has a negative impact on the battery life. In addition, if the mobile phone uses automatic shutdown, the internal voltage of the lithium battery will be too low due to excessive discharge, and it may not be able to start and charge. Therefore, lithium battery charging pays attention to "eat less and eat more". Frequent shallow charging and discharging is more helpful to prolong its life.            Lithium battery generally has safety protection circuit and various safety devices to ensure that the circuit of battery will be cut off automatically in case of overcharge, discharge and short circuit; too high internal pressure of battery will trigger the decompression of exhaust device; too high temperature of battery will trigger the hot melt protection device to stop the electrochemical reaction of battery. Therefore, unless there is a quality problem, the battery will not explode due to long-term charging. However, if the power supply is not unplugged after the battery is fully charged, the battery will remain fully charged. Although it will not explode, it will speed up the loss of battery capacity.            In addition, there are rumors that answering a phone while it's charging can cause an explosion. Lu Jianguo said that this statement is untenable. If there is such a danger, the product will set up the program of not connecting to the phone when charging. However, from a health point of view, the electric wire will limit the user's range of activity. When charging, it may make the user stay in a place for a long time, causing excessive muscle tension. Therefore, it is recommended to unplug the power supply and talk again. When charging, do not cover anything on the battery or put it on the bed to avoid fire.            It depends on what kind of battery you have. Like many lithium batteries now            First of all, repeated charging will not damage the battery, and repeated charging and discharging will basically not damage the battery. Because lithium element is more active and has no memory effect, the battery made of lithium element can be repeatedly charged and discharged. Now most of us (more than 90%) still keep our thinking in the shadow of the popular NiMH battery a few years ago, because nickel element itself is not active Jump, and the element has a memory effect on the electron, that is: remember the last impulse discharge depth! Therefore, if the battery is not used up or charged for a long time (fully excited nickel element - because it is not active), the best charging effect cannot be achieved, so the charging time is generally more than one night or several hours!            But now we are using lithium, which can't exist independently in nature and can only exist in compounds. You can refer to the periodic table of elements. The half-life of lithium is very short,