MacRumors published a quick guide on how to turn off Battery Health Management in macOS Catalina 10.15.5.

How to Turn Off Battery Health Management in macOS Catalina 10.15.5

Apple in the second macOS Catalina 10.15.5 beta added a new Battery Health Management feature for Macs, which is designed to prolong the battery life and battery health of modern Mac notebooks (aka those with Thunderbolt 3 ports) by reducing the rate of chemical aging.

How to Turn Off Battery Health Management in macOS Catalina 10.15.5