My lg g7 won't charge or power on

A few days ago i left my 4 year old LG G7 on my nightstand unplugged and i went to sleep.

When i woke up the phone was dead. It had drained overnight. I then plugged it in and charged it for several hours and it would not charge or even turn on.

When i try to charge it, nothing happens, nothing shows up on the screen. The red LED doesn't even light up. I tried the power + vol down. it didn't work. wireless charging doesn't work either. Nothing happens when i plug it into my pc.

Should i replace the battery? What should i do?