My Macbook Pro lasts about two days on battery while doing work (in clamshell mode, with the screen off). My Thinkpad drains its battery in less time than that

My Macbook Pro lasts about two days on battery while doing work (in clamshell mode, with the screen off). My Thinkpad drains its battery in less time than that in sleep. The removal of S3 is a travesty.