I have MacBook Pro (13-inch, 2018, Four Thunderbolt 3 Ports) Big Sur 11.2.1 helped with battery life and after spotlight finished in some point it even showed 6 hours, also tried NVRAM and SMC reset. At least when MacBook was closed battery hold the charge state. But at some point it was back to 1.5 hours... Installed Big Sur 11.2.2 now, and getting around 4.5 hours currently (depending on tasks), but still not the best. And Service Recommended is still there! Big "bug" Sur is the current right name. But for some reason it's not the case with laptops which already come with Big Sur installed. And Apple came up with battery replacement for MacBooks that will not charge past 1%... If 2016 and 2017... But they should replace for everyone who have the issue or at least lower the price for battery replacement service. Around $200 for their own mistake... Maybe it all gonna change with Big Sur feature Big Sur. As I've read they rebuild the Big Sur OS. I don't get it... how no one did not saw the problem with beta testing....