18650 Battery Capacity Tester 12V Lead Acid Battery
18650 Battery Capacity Tester 12V Lead Acid Battery
With resistance estimation method: According to Ohm's law, the resistance value = battery voltage divided by the expected discharge current, the resistance power selection is the battery voltage multiplied by the expected discharge current is more than twice, it should be noted that the battery full voltage is relatively high, to ensure full power voltage can not exceed over 3.0A current! 2A, for example, current tests needed 12V battery, the resistance required 6Ω power 50W, the new battery full charge voltage of 12V large approximately 13.5V In this case a maximum current of 13.5 / 6 = 2.25A less than. 3A, can be used. In addition, if the bulb test is used, the maximum current can only be half (1.5A). Because the cold resistance of the bulb is very low, the starting impulse current is very large. If it is too large, it may directly burn the circuit! ! ! !
Note: During the process of using resistance discharge, the resistance load will heat up seriously, please pay attention to safety!
Power supply voltage: DC4.5-6V (micro USB interface)
Working current: no more than 70mA
Discharge voltage: 1.00V-15.00V resolution 0.01V
End voltage range: 0.5-11.0V
Support through current: maximum 3.000A resolution 0.001A
Maximum error of voltage measurement: 1%+0.02V
Maximum error of current measurement: 1.5%+-0.008A
Maximum battery capacity range: 9999Ah (1Ah=1000mAh) The larger value is switched by decimal point shift. When it is lower than 10Ah, it is displayed as X.XXX, when it reaches more than 10Ah, it is displayed as XX.XX, and so on.
Circuit board size: 50mmX37mm
Finished product size: 50mmX37mmX17mm (length X width X height maximum position size, including copper foot height)
Note: In order to improve the voltage measurement accuracy, this circuit is specially designed with DC bias. When the terminal is connected nothing, a small voltage will be displayed , which does not affect the actual measurement. If you short the input terminal (absolute 0V) 0 is displayed. If you want to understand the principle, you can check the superposition theorem in electrical engineering.
1. The battery under test should be fully charged first.
2. Connect the positive pole of the battery under test to the input positive pole, and the negative pole to the negative pole of the input, not to be reversed (reverse connection with load may damage the circuit)! Load is connected to the positive output and a negative output, the tester to work through micro USB power supply (not available desktop or laptop USB powered), this time explicitly shown the battery voltage.
3. To start the test directly, just press the "OK" button, the tester can automatically formulate the appropriate termination voltage according to the full charge voltage of the battery, and will flash the display 3 times to start the test. Need to manually set the termination voltage, just press the "+" or "-" button to modify in the battery voltage display state , the termination voltage is displayed at the beginning of P, the back represents the voltage value, the resolution is 0.1V, after setting, press "OK" "start testing.
4. After the start of the test the tester is turned on the electronic switch controlled load, test data will discharge capacity (Ah), the electric discharge current flow between a substantially round (A) and battery voltage (V). When the battery voltage reaches a termination voltage is set, the tester load control switch off, which was shown in the data retention capacity (Ah) above and corresponding with the lamp blinks rapidly, the capacity of the display at this time is the actual discharge capacity of the battery amounts, by move about "OK" to terminate so that the data is stable flashing display, press the "OK" button again to restore power to just the state can replace the electrical battery test the next section ......
Error code and meaning:
Err1: The battery voltage is higher than 15V
Err2: The battery voltage is lower than the set termination voltage
Err3: The battery cannot bear the load discharge current or the line internal resistance is too large
Err4: current is too large (current exceeds 3.1A)
Second calibration operation :
Press and hold the three keys to power the tester, calibration mode, the calibration sample into the formal first displayed after the calibration frequency and recording the program explicitly shown 0u0A, this time after the short press of the positive and negative inputs "OK" button to complete the significant J10u 10.00V standard is applied between the positive and negative inputs to the press of the quasi-DC voltage is "OK" button, after displaying J2.0A, to the negative output (inflow direction) and the negative input (the outflow direction is applied a constant DC current 2.0A) Then press the "OK" button once to complete the calibration. The tester will pre-check the calibration data . If the calibration data is reliable, it will display 4 calibration numbers in turn and then exit. If the pre-audit believes that the data is not reliable, discard the data and exit.