Notes on 18650 battery charging

18650 battery charging precautions 18650 lithium battery is the most commonly used battery for various electronic and mechanical models. In addition to ensuring the quality of the battery itself, we also need to know some knowledge about its use. The numbers in the 18650 lithium battery are the external dimensions: 18 is the battery diameter of 18.0mm, and 650 is the battery height of 65.0mm. Common 18650 batteries include lithium batteries, lithium iron phosphate batteries and nickel-metal hydride batteries. Voltage and capacity specifications: Ni-MH battery voltage: 1.2v; common capacity: 2500mah; common capacity: 3.6v; common capacity: 1500mah-3100mah. 18650 battery charging precautions_18650 battery charging method The importance of the battery maintenance board: The battery maintenance board is a maintenance circuit installed on the negative pole of the battery. Its important function is to prevent the battery from being damaged due to overcharge, to prevent the battery from being damaged due to over-discharge, and to prevent the battery from being damaged due to excessive current. If the battery selected in these three important functions does not have a battery maintenance board, overcharging can be prevented by the charger maintenance circuit, and overcurrent is not what we need to worry about under the premise of passing the battery quality. However, overdischarge becomes the most direct problem and can damage the battery. Due to the characteristics of lithium batteries, if the battery is in the process of discharging, in addition to the battery discharge termination voltage value, but continue to discharge may cause the internal pressure of the battery to rise, positive and negative active materials are reversibly damaged, and the battery capacity is significantly reduced or even completely destroyed. . The battery maintenance board can cut off the circuit before the over-discharge occurs and stop the over-discharge to maintain the battery. Some electronic control module circuit boards have overcharge, overdischarge, and overcurrent maintenance functions, and have low dependence on the battery maintenance board. After the mechanical module chooses to add the maintenance board as much as possible, the battery cost only increases by about 1 yuan after all, but the effect is very large. In daily use, we'd better control the battery power at 95%-20% to ensure the long-term high-capacity battery life. Without long-term charging, the charged so-called lithium battery is responsible for the maintenance quality and accuracy of the processing circuit. The battery voltage is often 0.1v. The voltage exceeds the specification. The new increase from 4.1v to 4.2v will reduce the battery life by half. Progress 0.1v, one-third of the status (NASA) to do the experiment. In addition, none of the 18650 charger manufacturers on the market is a formal large-scale factory (including those with exquisite packaging, fine workmanship, and more than 100 yuan). Since the 18650 battery is an industrial power lithium-ion battery, not a civilian battery, it only appears in the retail market in the form of spare parts. In practice, manufacturers of various products, whether it is laptop batteries, mobile charging banks or any other electronic products, will design lithium battery maintenance circuits (the same purpose as the battery maintenance board). However, in order to save costs, many chargers on the market can only use the built-in battery maintenance board as the charger's maintenance circuit. Once a long time has passed, the safety of charging is difficult to guarantee. 18650 battery charging method When using a lithium battery, it should be noted that the battery will enter a sleep state after a period of time. When the capacity is lower than the normal value, the use time will be shortened. However, lithium batteries are easily activated. Only after 3 to 5 normal charge and discharge cycles can the battery be activated and return to normal capacity. Due to the characteristics of the lithium battery itself, it has almost no recall effect. Therefore, the user's mobile phone does not require special methods and equipment during the activation of the new lithium battery. Not only in theory, but also in my own practice, it is best to use the natural activation charging method from the beginning. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete it. Previous: What lithium batteries can be carried by plane?