HP Envy 15-u011dx x360 Battery Failure

I got a brand new HP Envy 15-u011dx x360 for my son, but since it got a battery problem, he didn’t like it. The problem is something like these scenarios: 1. ACĀ adapter plugged in, the message will say, connected but not charging. The AC LED (white) will blink and not steady (working condition). HP Utility