I received one of these a few days ago.
As a test I charged an old overcharged and bloated 200Ah cell to 3.65, waited an hour then plugged it into the tester with the cutoff set at 2.5 volts.
The problem I'm having is that when the unit is showing 2.6 volts, just before the shutdown, the voltage at the battery terminals is still around 3 volts, so the tester is shutting down prematurely.
The multimeters used are Fluke and BK precision, so I believe their readings are accurate, and there is only about a 50 millivolt or less voltage drop in the 10G wires between the cell and the tester.
The included instructions. and the font of all knowledge; YouTube, are of no help, so does anyone know how to calibrate these testers to read the correct voltage?
MakerHawk USB Load Tester 150W 200V 20A Resistor Adjustable Constant Current Electronic Load Tester Battery Capacity Tester Module Intelligent Discharge Resistance Power Tester
UPC: B07F3NHHST Guide Video: https://youtu.be/56ldIUjyqng. Two power supply methods: 1. DC6-12V DC5.0 power supply; 2. DC6-12V Micro USB power supply. Voltage measurement range: 0.00V ~ 200V, Current measurement range: 0.00A ~ 20A. How to operate: Set the capacity, power, time using the...
www.makerhawk.com
The problem I'm having is that when the unit is showing 2.6 volts, just before the shutdown, the voltage at the battery terminals is still around 3 volts, so the tester is shutting down prematurely.
The multimeters used are Fluke and BK precision, so I believe their readings are accurate, and there is only about a 50 millivolt or less voltage drop in the 10G wires between the cell and the tester.
The included instructions. and the font of all knowledge; YouTube, are of no help, so does anyone know how to calibrate these testers to read the correct voltage?