Battery not Charging, computer turns off when unplugged

Just replaced battery with ifixit battery, followed instructions meticulously, lost nothing, broke nothing. Turned it back on with power adapter, battery shows 95% charged, but shows “Battery is Not Charging” message. Computer powers off if power adapter in unplugged, and won’t power on if power adapter is not plugged in. Overall, it seems like the computer is running slower which worries me. System seems to recognize the new battery, its info shows up in the system report. Screen shots attached.