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You should never add chicken directly to your flock, no matter where they came from, quarantine them for awhile first to make sure they are 100% healthy and pest free. There are some articles here on adding, quarantine, etc, that is full of good info and advice...
I kept around 40 ex-battery hens a few years ago and from my experience they will take a few days to feel comfortably enough to go outside and will be easily spooked once they are out there, but after a few weeks they will be fine. They might go broody, in spite of what is said about that. I had...