How to use the lithium battery capacity tester to test battery capacity?

1. Simple method of constant resistance discharge. To use a multimeter and high-power resistor, first charge it fully. You can charge it in a cradle, such as a phone or a mobile phone. Connect the full charge of the lithium battery to this resistor, usually a 10 ohm 5W cement resistor to discharge until the voltage is lower than 2.75V, to obtain the total discharge time capacity u003d 0.37A* time. This method is relatively simple, but there are certain error. 2. Formal method: use a battery capacity tester, first charge to 4.20V, and then leave it for 1 hour constant current discharge, the arbitration method is 0.2 times, such as 1000mAh capacity, 200mA constant current discharge to 2.75V cut-off, calculate the time Time * constant current u003d battery capacity This is done in accordance with the national standard 18287 lithium battery regulations. If it is a nickel-metal hydride battery, the same is true, but the charging method is not constant voltage, and the discharge is cut to 1.0V per cell. This method requires special equipment. How to judge the true capacity of lithium batteries? Current self-test. Since there is no special regulated power supply for mobile phones at hand, this detection power supply uses mobile phone batteries, clamped by a universal charger, and connected to the mobile phone. Detection instrument|The meter is a MF47 digital multimeter. In the following detection current values, the integer current is measured in the 500mA range, and the decimal current is measured in the 50mA range. The accuracy of the current gear is ±2.5%. When the gear is switched, use a short-circuit wire to connect the two test leads. Self-test of lithium battery capacity. CECT9898 OEM mobile phone lithium battery has a nominal capacity of 3800mAh, and its battery volume is equivalent to that of other brand mobile phones 1500mAh. I conduct a capacity test on the battery of the CECT9898 OEM mobile phone I own. According to the specification, the capacity of the mobile phone lithium battery can be simply described as the power supplied when the overflowing battery is discharged to the final voltage (2.75V) at a temperature of 20±5°C at a rate of five hours. Based on this meaning, design and manufacture the discharge detection circuit by itself. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: Analysis on the composition and characteristics of lithium battery PACK