One of my neighbours a few years wanted to start keeping poultry. She got 4 battery hens that had finished their battery hen lifespan , had been rescued by a charity and given free of charge to suitable homes. Apparently the hens were in poor condition on arrival. But with tender loving care and a generous grass chicken run improved significantly health wise and were still producing a significant number of eggs. I have considered getting battery rescue hens. Would this be a good idea or would they be riddled with disease? I look forward to advice from members of BackYard chickens.