Battery technology is evolving and changing in a high rate. Batteries have become so popular in the modern era because of their numerous uses. There are many types of batteries that are classified according to their uses. Batteries can either be primary, secondary, industrial or vehicle battery. 18650 battery fall under secondary batteries.
What is an 18650 battery?
An 18650 battery is classified as secondary battery because it’s rechargeable. They are lithium-ion batteries meaning they use lithium ions as the main constituent of its electrolyte. Due to their light nature and ability to hold more energy, they are mostly used in portable devices like laptops and flashlights. When charging, some of its lithium ions that make the positive electrode move to the negative electrode and when discharging, the lithium ions move back to the positive electrode.
Advantages of 18650 batteries
- The have a long span.
- They can be used for an extensive range of applications.
- They have high voltage.
- They have a high capacity.
- They have a small internal resistance.
How to check an 18650 battery
An 18650 that is in good condition should have a nominal voltage of 4.2 volts. Any time your battery starts to behave differently like getting conspicuously hot while charging and the rate of self-discharging is high, you need to test its condition. First thing is to charge your 18650 battery and allow it to sit for 24 hours. If the battery attains a temperature of above 40 degrees Celsius while charging, it should be discarded or recycled. Test for the battery voltage using an 18650 battery tester or liitokala lii-500 after the 24 hours and if the voltage is below 4 volts at this point, it means it is self- discharging so discard or recycle it.
The next thing you need to do is to test for capacity for the battery that was above 4 volts. Using the 18650 battery tester, check the capacity of the 18650 battery. I would advise on working with batteries that test above 1800mAh. Don’t forget to charge the tester and unplug it when testing your batteries.
Batteries that have passed self -discharge test, voltage test and capacity test will now need to be tested for internal resistance. Testing for internal resistance will help determine the condition of the battery. The higher the internal resistance of your battery, the more they will tend to heat when charging and discharging.