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"Diymore 2pcs 20A 300W CC CV Step Down Module Adjustable DC 6-40V to 1.2-36V Voltage Regulator Buck Converter Constant Current Power Supply Module 20v to 12v Step Down"
Diymore 2pcs 20A 300W CC CV Step Down Module Adjustable DC 6-40V to 1.2-36V Voltage Regulator Buck Converter Constant Current Power Supply Module 20v to 12v Step Down
This step-down voltage module with a wide input voltage range from 6V to 40V, the step-down converter can accurately adjust output voltage and current.
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Electronics
Power Accessories
Power Converters
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1 comment of this product found across Reddit:
I've been using this voltage step down with my 19v batteries:
https://www.amazon.com/dp/B07Y7YB14L
It works great, but your 40v is right at the top of its range. Might want to measure your voltage when your battery is fully charged if you don't want to risk killing it. Or just risk it, they're cheap.