Some users told they test their batteries' capacities on different chargers, the testing results might be different, sometimes significantly. There are factors affecting the battery capacity tests on the smart chargers. Kindly read more details online:
https://www.xtar.cc/news/how-charger-settings-affect-battery-capacity-test-results.html
* Discharge Current: The higher the discharge current, the lower the measured battery capacity, and vice versa. This is because when the battery discharges quickly (i.e. the discharge current is high), the energy that can be extracted from the battery is reduced, resulting in a lower measured capacity. Therefore, if the discharge currents set by the chargers are different, the measured capacity results will vary.
* Cut-Off Voltage: According to the international testing standard IEC 61960-3 2017, the cut-off discharge voltage for 3.6/3.7V lithium-ion batteries is 2.5V. The higher the cut-off voltage, the lower the measured capacity.
* Test Temperature: The temperature during battery testing has a significant impact on capacity, with the ideal range being 20±5°C. Both low and high temperatures can affect the battery's discharge performance, then directly influencing its discharge capacity. When using different chargers to test battery capacity, it's important to ensure the testing temperature is consistent to obtain accurate comparison results.
* Capacity Grading Accuracy: A high-precision charger can significantly reduce measurement errors and provide more accurate results. For example, compared to professional capacity grading machine, the test accuracy of XTAR latest VX4 charger is over 95%. In a comparison test conducted by the XTAR laboratory under the same conditions, a randomly selected 1.5V AA 1200mWh battery showed a real energy of 1161mWh with the VX4 charger and 1129mWh with capacity grading machine. The accuracy error between them is less than 3%.
https://www.xtar.cc/news/how-charger-settings-affect-battery-capacity-test-results.html
* Discharge Current: The higher the discharge current, the lower the measured battery capacity, and vice versa. This is because when the battery discharges quickly (i.e. the discharge current is high), the energy that can be extracted from the battery is reduced, resulting in a lower measured capacity. Therefore, if the discharge currents set by the chargers are different, the measured capacity results will vary.
* Cut-Off Voltage: According to the international testing standard IEC 61960-3 2017, the cut-off discharge voltage for 3.6/3.7V lithium-ion batteries is 2.5V. The higher the cut-off voltage, the lower the measured capacity.
* Test Temperature: The temperature during battery testing has a significant impact on capacity, with the ideal range being 20±5°C. Both low and high temperatures can affect the battery's discharge performance, then directly influencing its discharge capacity. When using different chargers to test battery capacity, it's important to ensure the testing temperature is consistent to obtain accurate comparison results.
* Capacity Grading Accuracy: A high-precision charger can significantly reduce measurement errors and provide more accurate results. For example, compared to professional capacity grading machine, the test accuracy of XTAR latest VX4 charger is over 95%. In a comparison test conducted by the XTAR laboratory under the same conditions, a randomly selected 1.5V AA 1200mWh battery showed a real energy of 1161mWh with the VX4 charger and 1129mWh with capacity grading machine. The accuracy error between them is less than 3%.
