There are several important indicators:
First, charge and discharge magnification: the higher the better
"C" is a special symbol that describes the size of the battery charge and discharge current. 1C discharge on behalf of the battery within 1 hour from the full charge into the empty current size. IPhone 6 battery capacity of 1810mAH, then the battery 1C discharge current is 1.81 amps; BYD e6 electric vehicle used in each battery capacity is 200AH, then the battery 1C discharge current is 200 amps. If a battery is discharged at high magnification, the energy normally released is less than the low magnification.
Second, the number of charge and discharge cycles: the more the better
500 times the common value of lithium batteries, according to different materials produced by the lithium battery charge and discharge times ranging from 300-3000 times. The specific meaning of this value may be slightly different for each plant, which can be roughly understood as: according to the manufacturer specified charge and discharge magnification (such as 1C discharge, 0.3C charge; each time from 0% charge to 100%, according to the cycle) After 500 cycles, the battery capacity remained at the original 80%. Charge and discharge times and the use of the relationship between the use of too much, we give a few examples.
1, the impact of charge and discharge intensity on the number of cycles
Factory mark: each from 0% charge to 100%, 1C put, 0.3C charge, 500 capacity after the attenuation to 80%, which is the most stringent test cycle, you can not so strict, see below
If the cycle of each power is 25% -75%, 1C put, 0.3C charge, after 2000 capacity decay to 80%
If the cycle of each power are 50% -100%, 1C put, 0.3 charge, 1800 capacity after the attenuation to 80%
2, shallow light on the impact of life
Factory mark: each from 0% charge to 100%, 1C put, 0.3C charge, 500 capacity after the attenuation to 80%, is the most stringent test cycle, you can not so strict, see below
Each time the power cycle are 25% -75%, 1C put, 0.3C charge, after 2000 capacity decay to 80%
Each time the power cycle are 50% -100%, 1C put, 0.3 charge, 1800 capacity after the attenuation to 80%
The above two examples can be seen that the smaller the charge and discharge magnification, the more conducive to life expectancy; shallow shallow release is also conducive to life expectancy.
Third, the resistance: the smaller the better
This parameter varies with the load, temperature and other factors change at any time, with the battery life is reduced, the internal resistance is gradually increasing. The smaller the internal resistance of the battery can be high-rate charge and discharge, 18650 of the ordinary battery resistance in 50mΩ or so, power-type 18650 battery in 15mΩ or so. Want to know how much internal resistance need to use special equipment measurement, ordinary multimeter not.
Fourth, the battery consistency
Using the same material, the same process of production of electronic cigarette batteries in the capacity, internal resistance, charge and discharge curves on the higher the consistency of the better. Electronic cigarette battery can form a large group of batteries is very critical, the larger the size of the battery pack on the consistency of the higher requirements.