Third party reviewers seem to say the M3 mac does pretty well: https://www.tomsguide.com/news/macbook-pro-m3-and-m3-max-battery-life-tested-heres-how-long-they

Third party reviewers seem to say the M3 mac does pretty well: https://www.tomsguide.com/news/macbook-pro-m3-and-m3-max-battery-life-tested-heres-how-long-they-last https://www.tomsguide.com/news/macbook-pro-m3-and-m3-max-bat... Maybe yours is a lemon and/or should be replaced?