Intel-based Apple Notebooks: About lithium-ion and lithium polymer batteries
Learn about lithium polymer batteries and how they fall under the category of lithium-ion batteries.
MacBook, MacBook Air, and MacBook Pro computers come with lithium polymer batteries. Lithium polymer is an implementation of the lithium-ion battery chemistry. Lithium polymer still uses lithium (Li) ions to shuttle energy during charge and discharge.
While the physical battery inside your MacBook or MacBook Pro may state on the underside of the battery that it is "Li-Ion", it is using the lithium polymer implementation of this technology.
For more information on the batteries used in Apple portables, review http://www.apple.com/batteries/ .