1. Self discharge testing generally uses 24-hour self discharge to quickly test its charge retention ability. The battery is discharged at 0.2C to 3.0V, charged at constant current and voltage 1C to 4.2V, with a cut-off current of 10mA. After 15 minutes of storage, the discharge capacity C1 is measured at 1C to 3.0V, and then charged at constant current and voltage 1C to 4.2V, with a cut-off current of 100mA. After 24 hours of storage, the 1C capacity C2, C2/C1 are measured × 100% should be greater than 99%. 2. Internal resistance measurement: The internal resistance of a battery refers to the resistance experienced by the current flowing through the battery during operation. It is generally divided into AC internal resistance and DC internal resistance. Due to the small internal resistance of a rechargeable battery, when measuring DC internal resistance, the actual value cannot be measured due to the polarization of the electrode, which generates polarization internal resistance; Measuring its AC internal resistance can eliminate the influence of polarization internal resistance and obtain the true internal value. The AC internal resistance testing method is to use the characteristic that the battery is equivalent to an active resistor, give the battery a constant current of 1000HZ and 50mA, sample its voltage, rectify and filter it, and perform a series of processing to accurately measure its resistance value. 3. IEC standard cycle life test IEC stipulates that the standard cycle life test for lithium batteries is: after the battery is discharged at 0.2C to 3.0V/cell, it is charged at 1C constant current and voltage to 4.2V, with a cut-off current of 20MA. After being left for 1 hour, it is discharged at 0.2C to 3.0V (one cycle) for 500 cycles, and the capacity should be above 60% of the initial capacity. 4. Internal pressure test for lithium batteries: (UL standard) Simulate whether the battery is leaking or bulging at an altitude of 15240m (low pressure of 11.6kPa). Specific steps: Charge the battery 1C with constant current and voltage to 4.2V, cut-off current of 10mA, and then store it in a low-pressure box with a pressure of 11.6Kpa and a temperature of (20 ± 3 ℃) for 6 hours. The battery will not explode, catch fire, crack, or leak. 5. Drop test: After fully charged, the battery pack is dropped from three different directions at a height of 1m onto a hard rubber plate, twice in each direction. The battery pack's electrical performance should be normal, and the outer packaging should not be damaged. 6. The vibration test method for lithium batteries is as follows: the battery is discharged at 0.2C to 3.0V, then charged at 1C with constant current and voltage to 4.2V, with a cut-off current of 10mA. After being left for 24 hours, the battery is vibrated under the following conditions: the amplitude is 0.8mm, causing the battery to vibrate between 10HZ-55HZ, and the vibration rate increases or decreases at 1HZ per minute. The voltage change of the battery after vibration should be within ± 0.02V, and the internal resistance change should be within 5m