1: Look at the volume estimate. The smaller ones generally reach 600 to 900 mA/h and the larger ones exceed 1000 mA/h.
2. Use a battery tester.
3. After fully charging, discharge at a constant current of several hundred mA. Use a voltmeter to observe that the voltage drops to 3.5V, then stop discharging. Multiply the discharge current by the time. time (h) to obtain the capacity. For example, if you use a constant current of 300mA to discharge and it takes 2 hours to discharge at 3.5V, the battery capacity is 300mA*2 = 600mA/h. Note that the battery capacity will decrease after being used several times.
The capacity of a lithium battery refers to the amount of electricity it can hold. The unit is usually “ampere-hour” or “milliampere-hour.” For example: the capacity of a lithium battery is 500 mAh, which means that if theBattery current is 10mA in operation, it can work continuously for 50 hours.
Lithium battery capacity test is based on full charge voltage and termination voltage set as parameters. Since the minimum discharge voltage of the lithium battery is 2.75 V, therefore a voltage lower than 3 V makes no sense. Lithium battery testing; Fixed current discharge is generally expressed in C, and lithium batteries are generally tested with a discharge of 0.5 C.
1. Fully charge the battery. The voltage of a single lithium battery after full charging is 4.2V;
2. Use a multimeter to find a constant current of 0.5C; lithium battery. Compared to the battery In terms of capacity discharge, the final voltage is set to 3V;
3. Multiply the constant current discharge time by the discharge current to obtain thebattery capacity; constant current discharge cannot reach two hours, then the standard It is not enough to say the voltage, and the lithium battery may be counterfeited.
After the lithium battery capacity test is completed, performance tests, electrochemical tests and other items should be carried out. During the testing process of 3C lithium batteries, battery test modules and high-current shrapnel microneedle modules can be carried out. be used as connections. The conductive bridge can transmit large currents of 1-50A, and its performance is stable and reliable, which is conducive to stable testing.