Test battery capacity by discharging with constant current. For Alkaline AA and other cells.
The hardware is based on an Arduino Nano. Others are possible of course, nearly no limitations. The display is a Nokia 5110 LCD. This also is easy to modify. The constant current source is based on an OP-Amp, see link to EasyEDA project:
https://easyeda.com/BitsAndElectrons/destructive-batterie-tester
Display: https://github.com/olikraus/u8g2
presentation on the German channel "Elektrobits": https://youtu.be/Gl1ISn4Dsfc
presentation on the English channel "Bits and Electrons": https://youtu.be/sXIeAKB41Y0
Copyright (c) 2019 Rainer Urlacher
published under the MIT License