Can the lithium battery only be charged and discharged 500 times?

I believe that most consumers have heard that the life of a lithium battery is 500, 500 times the number of times, the battery will die, many friends in order to be able to extend the battery life, the battery is completely exhausted every time it is charged, so there is time for the battery life The impact? The answer is no. The life of a lithium battery is 500 times, not the number of recharges, but a cycle of charging and discharging. The so-called 500 recharges means that the manufacturer can achieve approximately 625 recharges at a constant depth of discharge (such as 80%), up to 500 recharge cycles. (80%*625u003d500) (ignoring the reduction of lithium battery capacity and other factors) However, due to various influences in real life, especially the depth of discharge during charging is not constant, the 00 charging cycle can only be used as a reference for battery life. Influencing factor 1: Depth of discharge and number of charges It can be seen from the experimental data that the number of charges is related to the depth of discharge. The deeper the depth of discharge of the battery, the fewer the number of charges. Charge times * depth of discharge u003d total number of completed charging cycles, the higher the total number of completed charge cycles, the longer the battery life, the number of times of charge * depth of discharge u003d actual battery life (ignore other factors) factor 2: overcharge, overdischarge, large The charging and discharging current prevents the battery from overcharging. Any form of lithium battery overcharging will cause serious damage to battery performance and even explosion. Prevent deep discharge below 2V or 2.5V, which may quickly and permanently damage the lithium battery. Internal metal plating may occur, which can cause a short circuit, making the battery unusable or unsafe. Most lithium batteries have an electronic circuit inside the battery pack. If the battery voltage is lower than 2.5v, exceeds 4.3v during charging or discharging, or the battery current exceeds a preset threshold, the circuit will disconnect the battery. Prevent large charge and discharge currents because they put too much pressure on the battery. Influencing factor 3: Environmental overheating or overcooling temperature also has a greater impact on the life of lithium batteries. Conditions below the freezing point will cause the lithium battery to burn out when the electronic device is turned on, and overheating conditions will reduce the battery capacity. Therefore, if the notebook computer uses an external power supply for a long time without removing the battery, the battery will exhaust and heat for a long time in the notebook computer, and it will soon be scrapped. Influencing factor 4: Long time no power, high full power, and low charge status have an adverse effect on the life of the lithium battery. Most of the electrical appliances or batteries sold are based on the 80% discharge rate. Experiments have shown that in some laptop lithium batteries, the battery voltage is usually allowed to exceed the standard 0.1 volt voltage, that is to say, from 4.1 volts to 4.2 volts, then the battery life will be halved, and another new 0.1 volt will be reduced 1/3 of the original. The more you charge the battery, the more it consumes power. Long-term low or no power will cause the internal resistance of electronic movement to become larger and larger, resulting in smaller and smaller battery capacity. Lithium batteries work best during the charging process, so the battery life is the longest. From the above points, the following points can be summarized to extend the capacity and life of lithium batteries. If the notebook computer is powered by an external power supply for a long time, or the battery power exceeds 80%, please remove the battery immediately. Usually do not charge the battery, charge to about 80%. Adjust the power options of the operating system, set the power alarm to be above 20%, and the minimum power is not less than 20%. For small electronic devices such as mobile phones, the power cord (including the charging USB port) should be disconnected immediately after charging. Charge it often, but don't charge it. Make sure not to let the battery of your laptop, mobile phone, etc. run out (automatic shutdown). If you are going to travel, be sure to fully charge the battery, but charge your appliances as much as possible. Use a smarter and more power-efficient operating system. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: How to increase the cruising range of new energy vehicles in winter?