New battery not recognized, old battery still works

I just completed the guide for replacing my battery using an official iFixit Battery Kit and it’s not being recognized.

• Only powers on when the magsafe power adapter is plugged in.
• No battery icon appears in the top toolbar.
• The magsafe adapter light glows orange.
• My System Report says there’s no battery installed.
• When I plug my old battery back in, it still works and the battery icon shows up.
• I’ve reset the PRAM and SMC multiple times.

What should I do? My suspicion is that iFixit sent me a dead battery.

So the strangest thing… as I’ve been waiting for my replacement battery, I’ve kept my laptop plugged in for about two weeks on and off since I first posted this question. I travelled from the high dessert to the ocean and when I booted up my computer, the battery icon showed up finally and showed 55%. So somehow along the way, my new battery started working. Here is the screenshot from Coconut. I’m wondering if I should trust this battery or if I should install the replacement. I will probably test out the replacement and compare using Coconut Buddy. Thoughts?