Lead battery float charger enclosure

I wanted a float charger to maintain a lead-acid battery. Since a commercial product is expensive, I purchased a DC-DC step-down module using the LM2596. It worked well but there is a risk of shorting as the base is bare. So I created an enclosure to hold this foundation.

[LM2596 Buck Step Down Power Converter Module LED Digital Voltmeter Display Adjustable Board DC-DC 2A Short Circuit Protection] (https://www.aliexpress.com/item/LM2596-Buck-Step-down-Power-Converter-Module-DC-4-0-40-to-1-3-37V-LED/32661094850.html?spm=a2g11.10010108.1000001.11.1cfb3eefv8PrHv&isOrigTitle=true) (This link is not an affiliate)

This explanatory note machine-translated Japanese to English with Google Translate.