How to test the quality of 18650 batteries?

How to test the quality of 18650 batteries?

At present, there are a wide variety of 18650 lithium battery pack products on the market, but there are also a large number of counterfeit products, so it is difficult to accurately judge the quality of the battery based solely on its appearance. In fact, the most reliable detection method is to measure the discharge time of the battery. 18650 lithium batteries can theoretically be recharged 1000 times and are widely used in various electronic fields due to their excellent working stability. Here are three effective testing methods to help you distinguish the authenticity and quality of 18650 batteries:

1. Voltage test: Use a multimeter to measure the voltage by contacting the probes of the multimeter with the positive and negative terminals of the 18650 battery. Normally, the voltage of a genuine 18650 lithium iron battery is about 3.20V, while the voltage of a high-quality 18650 lithium battery is about 3.8V. Poor quality or counterfeit batteries often have low voltage or no voltage output. By comparing the voltage measurement results, the quality of the battery can be preliminarily judged.

2. Internal resistance test: Prepare an internal resistance tester and place the 18650 battery on the internal resistance test fixture for measurement. The internal resistance of counterfeit batteries may be very small or almost non-existent, while the internal resistance of high-quality 18650 batteries is usually below 30 milliohms. By comparing the internal resistance test results, the quality of the battery can be further distinguished.

3. Capacity testing: In order to more accurately evaluate battery quality, a battery capacity divider can be used for testing. After placing the battery into the capacity divider, set the corresponding steps and battery parameters according to the specifications, and then conduct a capacity test. After being divided, the capacity of high-quality batteries should meet the standards.