I recently purchased my first Macbook Pro and I noticed that my battery life would go from 100% to 97-95% within 5 minutes of unplugging it from the power brick. It would take about another 5 minutes to go down another 5%. Today I talked to a technician at Apple and she looked at everything and ran a diagnostic and my battery looked sound. But I was still losing power faster than I thought I would. I ended up upgrading to Big Sur and now my battery life is doing great... actually retaining more percentage than it did when I purchased it! Does anyone know if battery life on a Macbook Pro can be remedied by a software upgrade? I am new to Mac so please educate me! Thank you!