1 Not charging after battery replacement
I recently replaced my battery with one I bought from ifixit. It worked fine for a few weeks but suddenly it stopped charging. When I connect the charger it indicates that it charges but the battery does not charge at all. I opened the phone, disconnected and reconnected the battery and it seemed to be OK for the next weeks. Since yesterday I have the same problem again and the same trick did not do anything at all. Any ideas?
Update (11/23/2019)
Thank you all for your help. An update: I checked the charger port flex cable which seems fine. Then I disconnected the battery and when I plug the charger the phone shows the apple logo. The battery cable also seems to be OK. Maybe the battery itself is faulty? Should I ask for a replacement battery?
1 
I have tried different cables with no luck. The port and flex cable also seem intact.
Johnny Parcharidis さんによる
Does the battery look swollen?
You could have gotten a faulty battery.
Matt Black さんによる
Nope. The battery seems fine. Should I try connecting it without the battery? Just to see if the logo comes up? Or maybe the battery is faulty without being swollen? @Matt Black
Johnny Parcharidis さんによる
When you put it on the charger, does it show anything on the screen? Can you power it on? Does the screen just stay black?
Matt Black さんによる