Charge the sample with 2 times the maximum continuous charging current recommended by the manufacturer；
The minimum voltage for this test is:
If the charging voltage recommended by the manufacturer does not exceed 18V, the minimum charging voltage in this test shall be twice the maximum charging voltage calibrated by the manufacturer or the smaller of 22V.
If the charging voltage recommended by the manufacturer exceeds 18V, the minimum charging voltage in this test shall be 1.2 times of the maximum charging voltage calibrated by the manufacturer.
The test lasts for 24 hours at an ambient temperature of 20 + 5 ° C.
Results: during the test and within 7 days after the test, there should be no disassembly and no ignition.

The sample battery used for the test is charged with a constant current of 10 * C5. Each battery or cell shall be attached with a thermal coupling component and then charged until the battery or cell explodes, leaks liquid, or the temperature of the shell surface returns to the ambient temperature or reaches a stable state. During the test, the over-current and thermal protection devices that react must be certified by safety regulations. If there is no approved protection device, it shall be short circuited.
Result: no fire, no explosion

The discharged battery shall be charged to the test voltage with constant current of 3CA and 3 times of the charging current recommended by the manufacturer, and then charged at constant voltage with the test voltage. Monitor the temperature change of the battery during the test. The test will be terminated in case of one of the following two situations: the continuous charging time of the battery reaches 7h and the larger value of the charging time defined by the manufacturer; The battery temperature drops to 20% below the peak.
Result: no fire, no explosion.

The battery is discharged at a constant current of 0.2 it a to the final discharge voltage specified by the manufacturer. Then, the sample battery is charged with a current of 2,0 it a at a voltage of 1.4 times of the upper limit voltage of a single string, which shall not exceed 6V, and 1.2 times of the upper limit voltage of multiple strings of cells multiplied by the number of strings (a single string shall not exceed 6.0V).
Result: no fire, no explosion.