Hey every everyone. So today I was going to fly my Q500 4K. When I go to turn on my controller then my drone, the drone starts beeping and the controller says it's in EMER mode. I saw that the battery was really low(forgot to charge it last time) so anyways I go to charge it and the charger itself is solid red which means error. I pulled the fuse out and it's good. Can anyone tell me what it could possibly be?