Why does the ifixit replacement battery not work?

I have replaced the oem battery with an ifixit battery. The phone does not turn on and there is no indication that the battery is working. Am I missing something? I tried charging the phone for a few minutes but nothing happens. Atleast the old oem battery just shows a dead battery symbol. I am concerned that the ifixit battery is defective. Thank you for any help.

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Will the phone charge up the original battery to where the phone powers on? Or does it continually say it's charging and won't turn on?

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