Ipad Not charging past 19% and shuts down after 2min run time

Hi everyone,

Just replaced the battery on my iPad Air.

Seems now the iPad won’t charge (first) past 28%. After 24 hours sitting on the official 2A Apple charger, I put it on the 1A (iPhone) for another 24 hours hoping maybe the first charge needed a slower rate. Still nothing.

I tried then to recalibrate it by using the iPad unplugged till 10% but it keeps dying on me (self rebooting) after about 2 minutes being on. It doesn’t seem related to how much power i use (playing a fancy graphical game vs sitting on the home screen), fairly around 2 min.

I tried also the reboot, reset settings, turning off some settings (airplane mode, refresh apps…) but nothing seems to clear the problem.

Any idea on what to try next? Thanks