Use 18650 special charger to charge the battery. After the charging time reaches 8 hours, measure the voltage across the battery with a multimeter. The nominal voltage of 18650 is 3.7 volts, which will reach 4.2 volts when fully charged. If the battery voltage cannot reach more than 4 volts after 8 hours of charging, then the performance of this battery has already begun to age.
Basic introduction
18650 lithium battery is commonly used in electronic products, and is often used as a battery core in notebook computers. Its model is defined as: for example, model 18650, that is, a cylindrical battery with a diameter of 18mm and a length of 65 mm.
The theory of 18650 battery life is that it can be charged 1000 times. Because of the large capacity per unit density, most of them are used for laptop batteries.
In addition, 18650 is widely used in various electronic fields because of its excellent working stability, such as high-grade bright flashlight, portable power supply, wireless data transmitter, electric heating warm clothes, shoes, portable instruments, portable lighting equipment, portable printers, industrial instruments, medical instruments and so on.