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What factors affect 18650 lithium battery 3000mah life?
There are many factors that affect the service life of UPS batteries, such as ambient temperature, discharge depth, charging voltage, etc., which will affect the service life. Moreover, it should be stored in the temperature range of -20℃~+40℃. If it needs to be stored for a long time, the battery must be fully Store it while charging; then I will introduce the relevant content in detail.
1. Main factors affecting 18650 lithium battery 3000mah life
1. Ambient temperature has a greater impact on the battery:
If the ambient temperature is too high, the battery will be overcharged to produce gas. If the ambient temperature is too low, the battery will be undercharged, which will affect the service life of the battery. Therefore, the ambient temperature is generally required to be around 25°C, and the UPS float voltage value is also set according to this temperature. In practical applications, batteries are generally charged within the range of 5°C to 35°C. If the temperature is lower than 5°C or higher than 35°C, the capacity of the battery will be greatly reduced and the service life of the battery will be shortened.
2. Discharge depth also has a great impact on battery life:
The deeper the battery is discharged, the fewer cycles it will be used, so deep discharge should be avoided during use. Although the UPS has a battery low-voltage protection function, generally when a single battery is discharged to about 10.5V, the UPS will automatically shut down. However, if the UPS is discharged under light load or no load, it will also cause deep discharge of the battery. The so-called depth of discharge refers to the percentage of the capacity that the user allows the battery to discharge when using the battery as a percentage of its standard capacity.
3. During storage, transportation, and installation, the battery will lose part of its capacity due to self-discharge:
Before being put into use after installation, the remaining capacity of the battery should be judged based on the open circuit voltage of the battery, and then different methods should be used to recharge the battery. For spare storage batteries, supplementary charging should be carried out every 3 months. The quality of the battery can be judged by measuring the battery open circuit voltage. Taking a 12V battery as an example, if the open circuit voltage is higher than 12.5V, it means that the battery has more than 80% energy storage. If the open circuit voltage is lower than 12.5V, it should be recharged immediately. If the open circuit voltage is lower than 12V, it means that the battery stores less than 20% of the electric energy and the battery cannot be used.
4. Battery charge and discharge current is generally represented by C. The actual value of C is related to the battery capacity:
For example, for a 100AH battery, C=100A. The optimal charging current for lead-acid maintenance-free batteries is about 0.1C, and the charging current cannot be greater than 0.3C. Charging current that is too large or too small will affect the service life of the battery. The discharge current is generally required to be between 0.05C and 3C. The UPS can meet this requirement in normal use, but it must also prevent unexpected situations, such as battery short circuit, etc.
5. Charging voltage:
Since the 18650 lithium battery 3000mah is a backup working mode, the mains power is in a charging state under normal circumstances and will only be discharged when there is a power outage. In order to extend the service life of the battery, the UPS charger is generally controlled by a constant voltage and current limiting method. After the battery is fully charged, it switches to a float charge state, and the float charge voltage of each cell is set to about 13.6V. If the charging voltage is too high, the battery will be overcharged, and conversely, the battery will be undercharged.
6. Because the maintenance-free battery adopts an absorption electrolyte system, it will not produce any gas during normal use. However, if the user uses it improperly and causes the battery to be overcharged, gas will be produced. At this time, the internal pressure of the battery will increase and the battery will be damaged. If the pressure valve on the battery is opened, the battery may burst.
2. How to store UPS batteries
1. When storing, please pay attention to the temperature not exceeding the range of -20℃~+40℃
2. When storing the battery, the battery must be stored in a fully charged state. Since part of the capacity will be lost due to self-discharge during transportation or storage, please replenish the battery when using it.
3. When storing for a long time, in order to make up for the self-discharge during storage, please perform supplementary charging. Storing at temperatures above 40C will have a negative impact on battery life, please avoid this!
4. Please store in a dry, low-temperature, well-ventilated place.
5. If the battery packaging is accidentally wetted by water during storage or transfer, the packaging carton should be removed immediately to prevent the wet carton from becoming a conductor and causing the battery to discharge or burn out the positive terminal.
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