Not booting after battery replacement

I just replaced my bat using the instructions on ifixit. The first night, I had it going to the low battery screen like it’s starting to charge. I let it sit there overnight, it’d occasionally ding like it was seeing a charger and show the apple logo. When I took it off the charger it stayed on for ~5mins then shut down. I couldn’t get it to come back without putting it back on the charger. Today I opened it back up to see if I had something connected wrong or something, and now all I get is an apple logo that shows up for a few seconds and then fades out. Can’t even get to that low bat screen anymore. Any thoughts on what troubleshooting steps to take next would be greatly appreciated.