Hi, I had your new battery installed an it won't charge past 2%.

If they’re anything like the 8 series, I don’t necessarily thing it’s an issue with the battery. A lot of people, mostly DIY-ers and beginners, will knock off a component near the battery connector that is part of the battery gas gauge circuit, which is pretty self explanatory.

I would at least try to confirm whether or not I’m right on this by using the old battery, if it’s not severely bent or damaged. If it charges normally, then it’s most likely the replacement battery or the connector wasn’t seated. If the issue still persists with the old battery, you might have knocked off battery gas gauge or something related. If that is the case, you can get it repaired by someone who is skilled in micro soldering. This is not a repair you should DIY as you can mess up your phone beyond repair real fast. I recommend iPad Rehab, STS Telecom, or Rossman Repair. All of them have youtube channels you can check out. https://www.youtube.com/watch?v=h3gD-JqD...