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HiLetgo 18650 Li-ion Lithium Lead-acid Battery Capacity Meter Discharge Tester Analyzer
- Power supply voltage: DC4.5-6V (micro USB interface) ; Working current: less than 70mA. Supported by current: the maximum 3.000A resolution 0.001A.
- The maximum measurement error voltage: 1%+0.03V ; The maximum measurement error of current: 2%+-0.010A.
- The discharge voltage: 1.00V-15.00V resolution 0.01V ; Termination voltage range: 0.5-11.0V.
- Board size: 50mmX34mm ; Product size: 50mmX36mmX17mm (length X width X high maximum position size, containing copper foot height).
- Note: this circuit in order to improve the voltage measurement accuracy, specially designed DC bias.when the terminal is what all don't pick will display a small voltage, does not affect the actual measurement.if you are short connected with the input terminal (absolute 0V) will display 0. To understand the principle can consult the superposition theorem in electrical engineering.
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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.
3. 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.
4. 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.
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)
1*HiLetgo Tester Analyzer
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Top international reviews
The pads to connect a cell are cleanly labeled. USB input makes it easy to drive.
The tester includes error codes for such things are corroded open cells on test.
Set the end voltage with the +/- keys and then hit 'OK'. The device then uses the included 5W resistor(s) to gauge the mAh of the cell. When the cell has run down to the end voltage, it displays the total mAh rating of that cell.
I'm using this to test ex-laptop 18650 cells, 14500 Li-Ion's and various Ni-MH's. The cell voltage range is impressive, starting from 1.5V and with a max of 15V.
All around, a good useful device.
So simply attach a cell to the labeled terminals (I used an 18650 holder) then attach something to act as a load to the device on the other terminals (kit comes with 2 7.5 ohm resistors which you can use, I used a 10 ohm i had handy) and then power the board via USB.
It will initially display the staring voltage (generally a little over 4 volts for an 18650) then you press OK and it will flash 3.0 volts (this is the automatically set voltage limit where it will stop charging to prevent cell damage) then it will start cylcing through 3 displays. A running tally of the capacity (in Amp Hours), the current being applied to the load (in my case about a 1/3'rd of an Amp) and finally the voltage of the battery. It will continue discharging until the voltage hits the 3v cutoff and then provide a rating (most of my older ones top out at around 1.0 AH)
I haven't tried but the board also supports other starting and cutoff voltages, the + and - also allow you to override the value that is used for the cutoff (You want to be careful with this as discharging a cell below a certain value will ruin it)
Great inexpensive device for testing cells!
Make sure you use short, fairly heavy wires to connect to your battery if you will be running more than very low current, to avoid too much voltage sag.
I love how the tester knows what about what discharge cutoff voltage to use, depending on the battery voltage when connected. This can be fine-tuned if you disagree with the tester's pre-sets.
Super quick and easy to program and run! You can run a pile o' cells through testing in a day.
Check out the Excel spreadsheet I added showing the various combinations of resistor load (in single, parallel or series), and at various battery voltages. Combinations that exceed the ratings of the tester are indicated in red.
I then can choose which cell to go into which portable enclosure. I am creating portable power packs for my Christmas Lightshow safety vests. Each person directing traffic will have a safety vest that will have pixel lighting that will flash according to each song that is playing.
The controller will be powered by a single 18650 with a recharge circuit.
This comes with two 7ohm resistors as the load to test battery capacity.
For 12v battery, serialize two 7ohm (14ohm) resistors has 0.8 amp over it during test, which is about 9.6w, which is above the 5W resistor spec. With a fan, the resistor temperature stays around 60C, so temperature should be monitored if not using a fan.
Each one of the resistors are .5 Mha . Add 2 and your discharge amount will be around 1 amp.
Buy this is you like good product at a crazy good price. A must have for battery salvagers.