I'm having the same issues. It was fine before I upgraded to Big Sur, now the battery dies really fast and is saying the battery capacity is significantly reduced. Chatted with apple support this morning they want me to bring it in saying the battery is bad. MacBook Pro 2017

I'm having the same issues. It was fine before I upgraded to Big Sur, now the battery dies really fast and is saying the battery capacity is significantly reduced. Chatted with apple support this morning they want me to bring it in saying the battery is bad.  MacBook Pro 2017 Update: After apple told me to bring my laptop in, I downgraded to Catalina and all is well. I hate that Apple is not being honest about Big Sur, its killing batteries. These MacBooks are not cheap!!!