Oneplus 7 Pro Replacement Battery only displaying at 100%

Hi,

I just replaced my original battery with an iFixit one, and I have attempted to calibrate the battery. I charged it to 100% and left it on for an extra 2 hours, and now after unplugging it, it won't drop from 100%. Have I done something wrong when trying to calibrate it? It did show as being at 45% when I first installed it, and charged to full as normal