Modern boards have their own heat sinks.
Dc dc step down adjustable constant voltage current power supply module.
No for charging the battery needs additional two diodes.
Zk j5x is a dc adjustable constant voltage constant current step down power supply module with lcd display hd display input voltage and output voltage current power and display status.
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Adjustable stable output voltage and current.
Yes constant current constant current setting values input reverse polarity protection.
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Output short circuit protection.