In the first place, you should
understand that a battery hen is unlikely to be in prime physical
condition, and it can take a few months to get them to a point
where they are looking and feeling like a healthy free range chicken
- but they can get there! 
There are several, essentially
aesthetic issues, that a battery hen might have;
-
Beaks : The first and
most obvious issue is that of a trimmed beak. In the battery
system, a hen will be debeaked by a hot machine knife. A debeaking
is permanent, but in the majority of cases it will not affect
your new hens ability to peck about - if for some reason it
did, then mash rather than pellets as her feed would help her
(and it is probably what she would have been used to). Food
and water dishes may need to be a little deeper to allow for
trimmed beaks.
-
Toe nails : Having lived
on a wire floor for so long there is a good chance that they
will have very long toe nails; while they will usually wear
down on their own, if the length is excessive, you can and should
trim them.
-
Missing Feathers : You'll
also find that battery hens will often have some feathers missing
- particularly around their neck due to the repetitive action
of reaching through a feeder fence to get to their trough of
food. Boredom and neighbours are other causes of featherless
patches.
Although the above issues could have led to
pain and infection in some of the hens, it is very unlikely that
you will be given one that has any major problems (as far as possible
re-homing organisations will always do their best to only pass on
healthy ones). Most issues will be aesthetic and resolved relatively
quickly with a few weeks of 'the good life'! 
When you consider the life that the battery
hen has become used to (in fact the only one she has ever known),
it is easy to see how her new life outside of the cage may seem
quite bewildering to her. It will be the first time she has walked
about, pecked for bugs, seen the sky, felt grass (or straw or mud)
under her feet, dust bathed etc. etc. Everything will be new - and
probably scary. This may result in a very timid bird, or it could
even cause her to be a little aggressive. She could "flop around,"
as if unsure how to use her limbs. She may not want to move around
a lot, and it can take a
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