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+Robert Llewellyn have you seen this /. article about IBM developing an air-breathing lithium battery. Should enable elec-cars to reach 500miles, is lighter than li-ion, and has 15x more energy density (than li-ion).

Could be a few years before this tech comes to fruition, though (e.g. 2018-2020).

IBM: http://www.ibm.com/smarterplanet/us/en/smart_grid/article/battery500.html
Article: http://www.extremetech.com/computing/126745-ibm-creates-breathing-high-density-light-weight-lithium-air-battery
NYT: http://www.nytimes.com/cwire/2011/02/03/03climatewire-ibm-on-the-hunt-to-perfect-the-lithium-air-c-62075.html
MrSeb writes "As part of IBM's Battery 500 project — an initiative started in 2009 to produce a battery capable of powering a car for 500 miles — Big Blue has successfully demonstrated a ligh...
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