How to set sleep mode to 40% macbook?

Question

macbook

After improper use of the macbook battery, it became involuntarily turned off by about 35%, the operating time decreased to 2 hours. There was an idea to get ahead of an involuntary shutdown by setting the transition to sleep somewhere at 40% in order to have time to save all the files or find a charge.
I dug up something like the pmset -u [haltlevel percent] command on the Internet, but the terminal swears and does not allow changing this percentage.
Maybe someone came across a solution to this problem?

Answer 1

Replacing the battery is not the solution?