A DIY battery tester built to overcome limitations of cheap commercial options. The project uses a shunt resistor circuit for smaller batteries and a more robust four-MOSFET constant current source design for large batteries like a 72V EV tractor pack. A Raspberry Pi Zero monitors voltage and current, runs a Python script to log data and graph results, and controls cooling fans for the MOSFETs' heat sink. The design handles batteries with BMS systems and high-current loads that off-the-shelf testers cannot manage.
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