MacBook Pro 16 inch : battery life
macbook pro 16 inch battery dead within 1hr 30mins after charging. No chrome usage. cycle count is normal. Apps are already updated.
MacBook Pro 16", macOS 10.15
especially:
My battery runtime is low
https://support.apple.com/en-us/HT204054#runtime
Leave it on the mains whenever it is convenient—battery only when necessary for portability.
If on the main 100% of the time—maybe once a month use on battery down to 50-60% say for a little exercise.
That's it— use it as you see fit.
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About Mac notebook batteries - Apple Support
https://support.apple.com/en-us/HT204054
Determine battery cycle count for Mac notebooks - Apple Support
https://support.apple.com/en-us/HT201585
Batteries - Maximizing Performance - Apple
https://www.apple.com/batteries/maximizing-performance/