Phone won't turn on. Even with new batteey

So with my LG V20 when i plug the phone into the charger it was telling me that my battery was at 0% so it will need to charge up some before in able to start it. The problem is it new charges up. So thinking it was the battery I bought a replacement one. And i still got the same excact message and it never said it had a charge. So i then found some one with the same phone and had them let me use their working and charge battery just so I can see if it power up and I got nothing at all and the battery was just working fine in their phone. Can someone help me figure out the problem. Please and thank you.