MacBook Pro 16in battery draining
Apps such as Spotify and other Electron/CEF apps can sometimes activate the dGPU for some reason and cause the battery to drain very fast. Other times these apps are just extremely poorly optimized and simply use quite a bit of processing power.
You can make sure that Automatic Graphics Switching is Enabled in System Preferences > Energy Saver. Then go to About This Mac and make sure that the Graphics listed is the Intel Graphics and that the Radeon graphics does NOT show up, if it is in the list then it is active which consumes a lot of power.
Lastly, check Activity Monitor and the Energy tab to see what the Energy usage is. It should also say the it is using the Integrated Graphics. You can also open the CPU and GPU monitor windows by pressing Command+3 and Command+4 respectively and checking if the usage is higher than expected.
One more thing, I have found that it often takes a few full charge cycles for the battery to "settle in" and perform how it should. When I first got my machine I noticed that my MacBook Pro's battery life increased quite noticeably after about 5 full charge cycles and since then has been good. There is also other stuff running for a short while on a fresh copy of macOS such as Spotlight indexing and miscellaneous other tasks.
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