Chosen Solution
I replaced the antenna, and put a new battery in. Everything fit back perfectly and was reconnect. When it came to putting the back cover panel back on, it wouldn’t go or slide back into place fully. How do I remedy this? Any tricks or tips would be appreciated. I don’t want to break it, so “force it harder” is not a good answer.
Push the battery against the phone more, maybe it’s not fully seated well with the adhesive behind it. Usually putting the rear cover on isn’t a issue on original back covers unless the battery has expanded.