What battery has more capacity: Lithium Polymer or Lithium-ion battery?
Both types of construction have similar characteristics in terms of degradation, charging behavior, and susceptibility to deep discharge problems, but:


Li-Polymer have a slightly higher energy density because of the way in which the separator (salt bridge) is made. This comes at a 10-30% increase in cost, however.
It's possible to make flexible batteries with Li-Polymer, and to make them thinner than Li-Ion.


Source: http://www.allaboutsymbian.com...