macbook stop

Which MacBook Pro model and year?

Apple information on the battery cycle count, and maximum cycle counts for various Mac models.

But you're probably headed for a battery swap, based on what's being reported... This if both booting in Safe Mode and testing with a second and newly-created login show the same shutdown symptoms, as has been mentioned above.

Try setting up another admin user account to see if the same problem continues. Please post back on whether or not this worked. Also try the Safe Mode. Please post back on whether or not this worked.

Isolating an issue by using another user account 

Safe Mode - About

If it works in the Safe Mode, try running this program when booted normally and then copy and paste the output in a reply. The program was created by Etresoft, a frequent contributor.  Please use copy and paste as screen shots can be hard to read. Click “Share Report” button in the toolbar, select “Copy to Clipboard” and then paste into a reply. This will show what is running on your computer. No personal information is shown. If the log won’t post, try posting it in Pastebin and provide a link in a reply        Pastebin

Etrecheck – System Information

what year is the portable? if older than 2014 I'd try to replace the battery.