3. Check battery health management settings
The battery health management is on by default when you run macOS Catalina 10.15.5 on a MacBook with Thunderbolt 3 ports. Your battery may drain to 90% or lower before it begins to charge again. This design feature extends the life of your MacBook lithium-ion battery. You can turn off this battery health management feature in Energy Saver preferences. We don’t suggest you change the setting unless you have a particular need.
In macOS Big Sur or later, you may get a “Charging On Hold” message on the Battery Status menu, and the MacBook battery is not charging. This new feature is for learning your charging habit and optimising battery charging. When the feature is enabled, your Mac will delay charging past 80% in certain situations 
You may need to charge the battery fully if you plan to use the Mac on battery outside without a power outlet. Click “Charge to Full Now” in the battery status menu to start charging.
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