Replaced battery, won't turn on, orange mag on but won't fully charge

I recently replaced the battery of my MacBook Pro I followed the iFixit guide directions to the T, after my original battery basically was going dead.

After finishing up, I tried turning the laptop on, but nothing happens when pressing the power button. Tried SMC reset but no luck. When I plug the battery into the charger, MagSafe charger is Amber, but never gets Green.

Even if the battery is unplugged from the logic board and the charger is plugged in, no dice.

Anyone had this happen? Any suggestions on how to bring it back to life? I’ve thought of putting the old battery in and seeing if maybe the IFixIt battery caused the issue, but wasn’t sure.

Thanks for any and all help!