Maybe something important: last June I Accidentally closed my MacBook with the charger between so my display broke. So another thing: I'm traveling and need my MacBook for my work (I'm a colorist and work in the film industry) I need it everyday. Until it suddenly shuts down and I was like: 'Yes that's the problem!' But he had no clue. I went to a computer store but they didn't know what was going on the guy said that he couldn't find anything weird in my MacBook (software) yes of course when the guy looked at it it worked. I've tried for several times to turn it back on sometimes it didn't even turn on and sometimes it turns on and then it shuts off again after seconds.
Then when I logged in it shuts off again.
I pushed the button again and now I could login I looked at the battery it was still 80% so I thought that's odd. So, when I put my MacBook in the charger and click the on button it went on for 5 sec and then turned off. I thought maybe the battery was dead and I didn't charge it. I opened it (I don't shut it down) and it was off. Two days ago I wanted to continue with my video project on my MacBook Pro.