According to the research results:
The rated voltage of the lithium iron phosphate battery is 3.2V, the high-end charging voltage is 3.6V, and the voltage low-end discharge discharge is 2.0V. Due to the different quality and process of positive and negative electrode materials and electrolytic materials used by different manufacturers, there will be certain differences in their performance.
So the low cutoff voltage you mentioned is 2.2V, which is normal.
Is the 18650 battery a lithium iron phosphate battery?
3.65 V.
As requested On Sohu.com, the full voltage of the lithium iron phosphate battery cell is 3.65V and the end-of-discharge voltage is 2.0V in order to protect the service life of. the battery cell, the battery manufacturer defines that the termination voltage will be higher than 2.0 V. Due to the characteristics of thebattery chemical material itself, the energy density of lithium iron batteries is lower than that of lithium polymer batteries, but the safety performance is higher and the price is lower.
Common 18650 batteries are divided into lithium-ion batteries and lithium iron phosphate batteries. The voltage of lithium ion battery is 3.6V and 4.2V, the voltage of lithium iron phosphate battery is 3.2V, the capacity is generally 1200mAh to 3000mAh, the Common capacity is 2200 mAh to 2600 mAh.
The rated voltage of a single cell of an 18650 lithium battery is generally: 3.6V or 3.7V.
The minimum voltage of End of discharge of an 18650 lithium battery is generally: 2.75 V. Voltage lower than this voltage can easily cause the battery capacity to drop significantly or even be scrapped. When discharging mostlithium batteries, the no-load voltage cannot be lowered below 3.2V, otherwise excessive discharge will damage the battery. Generally, lithium batteries on the market are mainly used with protective plates. not be detected, making it impossible to charge the battery.
The maximum limit voltage of 18650 lithium battery is: 4.2V. It is generally believed that the lithium battery is fully charged when the no-load voltage is charged to 4.2V. During the battery charging process. the battery voltage gradually increases to 3.7V. When charging the 18650 lithium battery, the no-load voltage cannot be charged above 4.2V, otherwise the battery will be damaged.
Advantages and applications of 18650 lithium battery:
The theory of duration life of 18650 lithium battery is one charge per cycle 1000 times, the density energy is very high, its capacity is 1.5 to 2 times that of nickel-metal hydride batteries of the same weight and it has a very low self-discharge rate. There are almost no “memory effects” or toxic substances.
Widely used in laptop batteries, electric vehicle batteries. In addition, because 18650 has very good work stability, it is widely used in various major electronic fields: often used in high-end, portable, bright flashlights. Bao power supplies and charging, wireless data transmitter, electric heated clothing, shoes, convenience portable instruments, portable lighting equipment, portable printers, industrial instruments, medical instruments, etc.