ZB2L3 BATTERY CAPACITY TESTER

Specifications:
Power supply voltage: DC4.5-6V (micro USB connector)
Operating Current: less than 70mA
Discharge voltage: 1.00V-15.00V 0.01V resolution
Termination voltage range: 0.5-11.0V
Supported by current: 3.000A 0.001A resolution
Maximum voltage measurement error: 1% + 0.02V
Maximum current measurement error: 1.5% + - 0.008A
Maximum battery capacity range: 9999Ah (1Ah = 1000mAh) greater value by shifting the decimal point to switch, when the display is less than 10Ah X.XXX, as shown above to achieve 10Ah XX.XX, and so on.
Board size: 50mmX37mm
Finished Size: 50mmX37mmX17mm (length X width X height maximum position size, contains copper foot height)

Step 1:

Link to buy - http://s.click.aliexpress.com/e/c4UjnSjm.

Step 2: Connect the Battery

1. The first test should be fully charged battery.
2. Connect the battery to be tested positive to positive input, a negative input to the negative, can not be reversed (with load reversal may damage the circuit)! Load connected to the output of the positive and negative output, to work through the tester micro USB power supply (not available desktop or laptop USB powered), then the battery voltage.

Step 3: Starting the Test

Direct start test need only one press of the "OK" button, the tester can automatically develop an appropriate termination voltage of the battery full charge voltage, and will start flashing after the test three times. Need to develop artificial termination voltage only when the battery voltage display state by pressing "+" or "-" buttons to modify the termination voltage display beginning with P, behind the representative voltage resolution 0.1V, set up after pressing the "OK "start testing.

Step 4: Test Finished

After the start of the test the tester will control the load of the electronic switch is turned on, the test data shows that the process will release capacity (Ah), current discharge current (A) and battery voltage (V) between the wheel was. When the battery voltage reaches the set cut-off voltage, load control switches off the tester display data stays in capacity (Ah) and above and the corresponding indicator flashes quickly together, now displays the actual capacity of the battery is discharging capacity, about the press "OK" to terminate flashing allows stable data display, press again "OK" button to return to the power-on state can just replace the battery test the next section ......

Step 5: Error Codes and Their Meanings:

Err1: battery voltage is above 15V
Err2: battery voltage is lower than the termination voltage
Err3: Battery can not afford to load or discharge current line too much resistance
Err4: overcurrent (current exceeds 3.1A)

Step 6: Note

Note: Use the resistance of the discharge process, resistive load will seriously heat, please pay attention to safety!
This circuit voltage in order to improve the measurement accuracy, specially designed DC bias, when the terminal displays nothing then a small voltage does not affect the actual measurement, if you are shorting the input terminals (absolute 0V) will show 0

Comments

[Sadikin Araf]

Can I replace the resistors with something else that can draw 1amp like a led or something?

[gregvp]

No. LEDs have high resistance when dark and very low resistance when on. You always need a series resistor with a LED anyway.

To test the capacity of a battery using this device you need the same resistance all the time, independent of the battery's voltage, which LEDs don't provide. Use a resistor, and it must be physically big.

For 1 amp your resistor needs to be the same value as the battery's voltage (12V battery: 12 ohm resistor) and the power rating of the resistor needs to be at least the same also (12 watts). In practice a 12W resistor would get extremely hot, so it would be better to use a 50W rated resistor.

If the resistor for your 12V battery test has lower resistance (say 6 ohms), the current increases (2 x 1A = 2A) and the power increases with the square of the current (2 squared x 12W = 48W). That's a very hot resistor! By contrast a 22 ohm 50W resistor will be a bit warm, with only about 3 watts dissipated in it.

The specified resistors (2 of 7.5 ohm 5 watt cermet) are just about OK for testing a single 18650. They'll still get hot. 2 x 7.5 ohm in parallel is 3.75 ohms resistance, therefore approx 1 amp from the battery with a 3.6V 18650, so about 3.7 watts in the resistors out of the nominal 10W total rating of the pair. They will get hot and may burn you if you touch them.

To test at a quarter of the the current (and so a sixteenth of the power), put the resistors in series instead of parallel. That would be safer--but it may not match the normal usage of the 18650, so in the test the battery will look better than in real life. The test will still tell you if there is something seriously wrong with an 18650 and it will allow you to match 18650s with similar voltages and capacities.

[ddodge40]

There is a 4 pin connector location above the display on the right hand side. I can measure 3.3 volts on the square pad, the next one seems to be ground. The next two have some serial data on them that varies with the value on the display. Any ideas on how that might be logged?

[ddodge40]

It now looks like the ST Microsystems SWIM bus. Ned to know which registers contain the data

[wings2004]

What is the resistor value on this? Mine didn't come with resistors.

[thagoson]

As show in the photo step 2 and 3. Two 5W 7.5 Ohms power resisters to be connected in parallel as a load of the battery with the yellow wire in the photo.