When I try to charge my Iphone 6 it keeps showing red battery?

I just found it to have the red battery symbol and when I unplug it from the charger it says charge the phone, it won't turn on, thank you for any help

How long have you had your phone for? Apple products are known for batteries that wear down quickly, and that is likely what happened here. The reason it always shows red is that the battery can no longer hold a full charge. You may need to install a new battery.

Take it to Apple, they might help. Seems like a battery issue.