Case foundation basement holder for 35W USB DC load resistor electronic adjustable discharge 18650 resistance battery capacity tester
thingiverse
It is a foundation for adjustable resistor I've bought from aliexpress: https://www.aliexpress.com/item/35W-USB-Load-resistor-Interface-Discharge-battery-test-capacity-aging-with-fan-for-charger-power-bank/32713091489.html You will need to replace two screws with a little longer.
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