Replacement Battery Not Charging - Boot Loop

I installed the new iFixit battery on my wife's Apple Watch Series 5 40mm. It appears that the new battery is completely dead. After placing on the charger, it displays the apple logo for a few seconds, goes completely black then displays the apple logo again. It just keeps looping and never fully boots or shows that it's charging. I replaced with the original battery and it boots fine. What can I do?