Very low battery life

Also see this Apple article:

See how apps affect Mac performance, battery runtime, temperature, and fan activity - Apple Support

Apps that commonly reduce battery runtime are anti-virus apps, torrent apps, and so-called "cleaning/tune-up" apps.

Running the computer with an external monitor while on battery can also deplete the battery charge faster than using only the internal display.

Hi,

Try to contact Apple support or make Genius Bar reservation to tell them about the battery issue.

https://support.apple.com/contact

https://www.apple.com/retail/geniusbar/

Before that resetting SMC could solve the issue.

https://support.apple.com/en-us/HT201295