Dell G5 5587 Random Shutdown

I own a Dell G5 15 5587 that’s approximately 3 years old. It has run without any issues up until a couple days ago. I was playing games and it just shut off randomly and I didn’t think too much of it since I thought it had just overheated. I let it sit until it had cooled down and turned it back on and continued without any problems. However, the next day I went to turn it back on and it shut off like 10 seconds into the start up, so it couldn’t have overheated this time. I did a hard reset and turned it back on and tried doing a BIOS diagnostic test and I got the error stating the battery was nearing the end of its usable life. I assumed I just needed a new battery so I ordered one and left the laptop untouched until I received the new one. I replaced the battery no problem, turned it on, assuming that was the fix however it shut off about 10 seconds into the startup once again. I have no idea what the problem is now since I was under the impression it was the old battery.