Caporegime
Sorry, I'm confused?
Which part?
http://www.memtest.org - run this in windows if you can
http://www.numberworld.org/y-cruncher/ - just Google CPU stress tester for others I guess, no idea what this one's like.
https://benchmarks.ul.com/news/check-your-pcs-stability-with-new-3dmark-stress-tests - GPU stress test
You're saying it's only crashing in games, so doing the above should make your operating system NOT crash.
You also mentioned you was using Windows 10, did you laptop come with windows 10? If not, try an older version and try everything again, including the games.
Or if you can't be bothered with the above, try some older graphics card drivers for your laptop,or newer.
As for taking the battery out, just YouTube it