http://en.wikipedia.org/wiki/Lithium-ion_battery#Battery_life http://en.wikipedia.org/wiki/Lithium-ion_battery#Battery_lif... > The rate of degradation of lith

http://en.wikipedia.org/wiki/Lithium-ion_battery#Battery_life http://en.wikipedia.org/wiki/Lithium-ion_battery#Battery_lif... > The rate of degradation of lithium-ion batteries is strongly temperature-dependent; they degrade much faster if stored or used at higher temperatures. That might be related. MacBook Airs get really hot even if you aren't doing anything too taxing.