Fixed- Battery drain issue, Battery service recommended, Battery capacity reduced of MacOS Big Sur

These seven steps solved my Macbook battery drain problem.
I am using macOS Big Sur and the Mac reports:-
- Battery service recommended
- Battery capacity reduced
- Important battery message
- the battery's capacity is significantly reduced. to restore capacity, please check your service options.
​- Mac using significant energy

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- Please watch the upper ☝︎ video carefully and follow the steps. (in case the video doesn't work, press on this link) 
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