Phone wont charge after water damage repairing (Turns on and works)

I have recently cleaned up a Xiaomi redmi note 4X. It turns on and works with whatever charge is left in the battery.

I think the shown battery level is incorrect. Stays green at 40% (with green led notification)

It is not charging further. When switched off the led stays green as if it was charged, never over 40%.

Ampere shows is consuming battery and not charging. It showed usb cable connected, but did not recognise it again after unpluging and pluging again.

I fully discharged a replacement battery doing tests, it wont charge. Now I am working with the original battery which is at 40%.

Any ideas?