Are Daniell cells rechargeable (reversible)?
The Daniell cell is not rechargeable. According to this Wikipedia article:  


  In the Daniell cell, the porous barrier cannot prevent the flow of
  copper ions into the zinc half-cell. Hence, recharging (reversing the
  current flow by an external source of EMF) is impossible because, if
  the zinc electrode is made to become the cathode, copper ions, rather
  than zinc ions, will be discharged on account of their lower
  potential.