MacBook Pro shuts off completely after few minutes, please help...

I have the latest software of everything Mac and always do my updates. My MacBook Pro is the silver keyboard edition (I cant keep it on long enough to tell which one exactly).

Here's the story. I'm in Spain, my Mbp has never ever messed up at all, I love the thing. I just updated an adobe flash update that popped up, I did the restart like it said and since then, I can't keep it on for more than a few minutes.

I did the resets, the SMC and other pr reset. Nothing. I have absolutely no idea what's going on.

Any help would be greatly appreciated. I am using my ipad to type this.

Thanks

I replaced the battery last year and it is at least in the 90% health range.

It's about 5 years old. It just randomly cuts off. I tried to do an apple hardware test on it (restart it and hold the d button) but it doesn't work at all, just goes into my log in screen. Then after I log in, it's just a matter of time before it completely shuts off.

Is there any thing like a test I can do to see what the problem is?