What are the standards for measuring the capacity of Panasonic batteries?
At present, Panasonic battery capacity has the following marking methods, such as C20, C10, C5 and C2, which indicate that the discharge rate of 20h, 10h, 5h and 2H is the actual capacity. If the capacity is at 20 h discharge rate, the indication should be C20, C20 = 10Ah battery, which refers to the capacity value obtained by 20 h discharge of C20/20 current. Converted to C5, that is to say, discharging four times the current specified in C20, the capacity is only about 7Ah. Electric bicycles generally discharged at high current within 1 to 2 hours while Panasonic batteries discharged within 1 to 2 hours (C1 to C2), which is close to 10 times the current specified. So the actual energy it can supply is only 50% to 54% of the discharging capacity of C20. Panasonic battery capacity is marked as C2, that is, capacity marked by discharge rate of 2h. If it is not C2, it should be calculated to get the correct discharge time and capacity. If the capacity marked by 5h discharge rate (C5) is 100%, the actual capacity will only be 88% in 3 hours, 78% in 2 hours, and 65% in 1 hour. The labeled capacity is assumed to be 10Ah. Now, the actual electric quantity of 8.8Ah can only be obtained by discharging for 3h; if discharging for 1h, the electric quantity of 6.5Ah can only be obtained, and the discharge rate can be reduced at will. The discharge current > 0.5C2 not only reduces the capacity of the battery, but also affects the life of Panasonic battery. Similarly, for batteries marked (rated) capacity C3, the discharge current is C3/3, i.e. 0.333C3, if C5, the discharge current should be 0.2C5, and so on.
Connect the red fish clamp of YDT7230 lead-acid battery capacity tester (hereinafter referred to as "capacity tester") output line with the positive pole of the charged lead-acid battery, connect the black fish clamp of the output line of the capacity tester with the negative pole of the charged lead-acid battery, turn on the power switch of the capacity tester, and display the "serial number", "time", "voltage" and "voltage" respectively in the four digital display areas of the panel.“ Electric current. Among them, "serial number" denotes the serial number of the lead-acid battery under test; the "time" display value is in minutes, the longest display is 999 minutes; after discharge time is greater than 999 minutes, the display "000", "00l", "10Omin", "l0Olmin",... "Voltage" and "current" represent the current voltage and discharge current of lead-acid batteries. After startup, the tester can automatically display 1-3 measured lead-acid battery data in turn. Press the "switch" button, then stay on the lead-acid battery indicated by the "serial number", and display the data of "voltage", "current" and "discharge time" of the lead-acid battery immediately. Press the "Switch" button again, then continue to display in turn.
The capacity tester can control "start" and "stop" separately for each discharged Panasonic battery. When the serial number is displayed as "l", "2" and "3", press the "start" button, light the indicator light corresponding to the serial number, and the corresponding lead-acid batteries start to discharge, and start to display the discharge time, discharge current and discharge voltage. If the serial number of lead-acid battery is not connected, the current will be displayed as "00.00". When the discharge voltage reaches 10.5V, the discharge will stop automatically and the discharge time will be locked. In the discharge process, press the "stop" button, the corresponding indicator lights out, the current display is "00.00". The discharge time is latched, indicating the duration of the discharge from the beginning to the end of the discharge.