J3 2016 not charging

Hi,

I just replaced the screen of a J320 (aka J3 2016) and it just won't charge. The thing is I measured the voltage on the battery pins and it reads 4.18V. With the phone off and the battery installed, I plug the charger and in stead of the battery screen, the phone just turns on. I turn it off, restart it and the battery percentage went up a little (from 48% to 53%). I cleared the cache, tried power button for a minute method and still nothing.

What is going on here?

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