Welcome to the official website of ESTL!

Current location: Home > Test > Battery test > Electrical safety tests

Overcharge test

Partial certification program

Overcharge test requirements

UN38.3 certification

  Charge the sample with 2 times the manufacturer's recommended maximum continuous charging current
    The minimum voltage for this test is:
    If the manufacturer's recommended charging voltage does not exceed 18V, the minimum charging voltage for this test should be twice the manufacturer's rated maximum charging voltage or the smaller of 22V.
    If the recommended charging voltage exceeds 18V, the minimum charging voltage for this test shall be 1.2 times the maximum rated charging voltage of the manufacturer.
    The test lasts for 24 hours at an ambient temperature of 20 ± 5 °C.
    RESULTS: There should be no disintegration and no fire during the test and within 7 days after the test.

UL certification

  The sample cells used for testing are charged at a constant current of 10*C5. Each cell or cell is labeled with a thermal coupling and then charged until the battery or cell explodes, leaks, or the temperature of the surface of the casing returns to ambient temperature or A stable state is reached.
    In the test, the reacted overcurrent and thermal protection devices must be certified for safety and should be short-circuited without an approved protective device.
    Result: No fire, no explosion.

CQC certification

  The fully charged battery is first charged to the test voltage with a constant current of 3 times and 3 times the recommended charging current of the manufacturer, and then charged with the test voltage at a constant voltage. During the test, the battery temperature was monitored. When one of the following two conditions occurred, the test was terminated: the battery continued to charge for 7 hours and the manufacturer defined the charging time to be the larger value; the battery temperature dropped to 20% below the peak value.
    Result: No fire, no explosion.

CB certification

  The battery is discharged at a constant current of 0,2 It A to the final discharge voltage specified by the manufacturer. The sample cell is then charged at a constant current of 2,0 It A.
    Result: No fire, no explosion.

Online message/ Messages
Service Hotline400-840-8988
Address: 2st floor, B Area, Jinbaisheng Industrial Park, Headquarters 2 Road, Songshan Lake Hi-tech Industrial Development Zone, Dongguan City, Guangdong Pr., China. Telephone: 0769-8507-5888-6617 Fax: 0769-8507-5898 Mailbox: net01@gdestl.com
Wechat Public Number

Focus on Wechat
Public Number


7*24-hour service hotline


Online consultationServe you sincerely


二维码Focus on Wechat