page_title: Lithium polymer battery
section_title: Applying pressure on LiPo cells
hierarchical_section_title: Lithium polymer battery / Applying pressure on LiPo cells
caption_attribution_description: English: NASA Prototype Lithium-Ion Polymer Battery 30 volts, 50 AH Battery 8 Cells 1500 Wh – 20 kg total mass – 75 Whr/kg 7.8 liter vol – 190 Wh/l
context_page_description: A lithium polymer battery, or more correctly lithium-ion polymer battery, is a rechargeable battery of lithium-ion technology using a polymer electrolyte instead of a liquid electrolyte. High conductivity semisolid polymers form this electrolyte. These batteries provide higher specific energy than other lithium battery types and are used in applications where weight is a critical feature, such as mobile devices and radio-controlled aircraft.
context_section_description: Unlike lithium-ion cylindrical and prismatic cells, which have a rigid metal case, LiPo cells have a flexible, foil-type (polymer laminate) case, so they are relatively unconstrained. 
  Being lightweight is an advantage when the application requires minimum weight, as in the case of radio controlled aircraft. However, it has been established that moderate pressure on the stack of layers that compose the cell results in increased capacity retention, because the contact between the components is maximised and delamination and deformation is prevented, which is associated with an increase of cell impedance and degradation.
caption: An experimental lithium-ion polymer battery made by Lockheed-Martin for NASA
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