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Use the multimeter to check DC equipment that is higher than the battery's rated voltage. For example, test a 9V, 1.5V dry battery with DC10V and DC2V gear tests.
Connect the positive and negative electrodes of the lithium battery with test needles after selecting the gear based on the voltage rating of the lithium battery. When the test voltage is higher than or equal to the battery's rated voltage. The battery appears to be in fine working order. The battery can be used on electrical equipment with a short discharge current when the test voltage is less than 10% of the rated voltage.
It is important to note that the voltage of rechargeable batteries is often 15% to 25% lower than that of comparable batteries. The 5# battery, for example, has a voltage of 1.5V, whereas rechargeable batteries have a value of 1.2-1.3V. As a result, the battery's rated voltage should be double-checked.
The 3.7V 18650 lithium battery now has a life span of 500 to 1000 cycles, whereas the 3.2V 18650 lithium battery has a lifespan of more than 2000 cycles. Of course, the concept is that a certified battery manufactured by a regular manufacturer will have a very short life if it really is a defective or fake battery.