Why is no Battery Health button shown in my Preferences?
Macbook Air 2017, Big Sur 11.7
About battery health management in Mac notebooks - Apple Support explains:
"Battery health management is on by default when you buy a new Mac notebook with macOS 10.15.5 or later, or after you upgrade to macOS 10.15.5 or later on a Mac notebook with Thunderbolt 3 ports."
MacBook Air (13-inch, 2017) - Technical Specifications:
- Thunderbolt 2 port (up to 20 Gbps)