According to Apple's specs, the Air has a polymer battery. http://www.apple.com/ipad-air/specs/ However, the images of ifixit's teardown do not indicate a polymer battery. http://www.ifixit.com/Teardown/iPad+Air+Teardown/18907 In contrast, the mini teardown includes the word "polymer" on the battery. http://www.ifixit.com/Teardown/iPad+mini+Wi-Fi+Teardown/11423 Is it possible the Air's battery is polymer, but not noted on the battery? Also, does it matter? My understanding is that polymer batteries are typically good for far more power cycles than regular lithium-ion.