magnet train kids project with long coil and battery

 https://www.youtube.com/shorts/1syLTUbZoSY?feature=share

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RUIDENG HD25 HD35 adjustable DC load tester 5-20 volt 35 watt Load tester for batteries with voltage current display

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  we can test batteries and power sources power banks with a meteer in between to test max capbilities or if rated rating are correct. we can set voltage from 5 volt to 20 volts with button and adjust current with a rotating knob.  Max power is up to 35 watt. this is tested in the bellow video. https://robu.in/product/rd-hd35-trigger-qc2-0-qc3-0-electronic-usb-load-resistor-discharge-battery-test-adjustable-current-voltage-5a-35w/
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