The Collaborative International Dictionary of English v.0.48:

Batter \Bat"ter\ (b[a^]t"t[~e]r), v. t. [imp. & p. p. Battered
   (b[a^]t"t[~e]rd); p. pr. & vb. n. Battering.] [OE. bateren,
   OF. batre, F. battre, fr. LL. battere, for L. batuere to
   strike, beat; of unknown origin. Cf. Abate, Bate to
   abate.]
   [1913 Webster]
   1. To beat with successive blows; to beat repeatedly and with
      violence, so as to bruise, shatter, or demolish; as, to
      batter a wall or rampart.
      [1913 Webster]

   2. To wear or impair as if by beating or by hard usage. "Each
      battered jade." --Pope.
      [1913 Webster]

   3. (Metallurgy) To flatten (metal) by hammering, so as to
      compress it inwardly and spread it outwardly.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

battered \battered\ adj.
   1. In deplorable condition; as, the battered old Ford station
      wagon.

   Syn: beat-up, beaten-up, bedraggled, broken-down,
        dilapidated, ramshackle, tumble-down, unsound.
        [WordNet 1.5]

   2. Hit or pounded repeatedly and violently with heavy blows;
      as, a battered old car; antomyn of unbattered. [Narrower
      terms: buffeted; storm-tossed, tempest-tossed,
      tempest-tost, tempest-swept]
      [WordNet 1.5]

   3. Damaged especially by hard usage. his battered old hat
      [WordNet 1.5]

   4. beaten repeatedly; -- of people; as, a battered child; the
      battered woman syndrome; a battered wife.

   Syn: beaten.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

battered
    adj 1: damaged by blows or hard usage; "a battered old car";
           "the beaten-up old Ford" [syn: battered, beat-up,
           beaten-up]
    2: damaged especially by hard usage; "his battered old hat"
    3: exhibiting symptoms resulting from repeated physical and
       emotional injury; "a battered child"; "the battered woman
       syndrome"