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Tesla (and many others) use Lithium-Ion batteries of course, expensive but best Wh/kg. The battery is usually the single most expensive component of EV, some vendor lease the battery.

The Modec van uses Zebra batteries with charge-discharge effiency above 90% (IIRC).

http://en.wikipedia.org/wiki/Modec
http://en.wikipedia.org/wiki/Zebra_battery

Even with NiMH AA batteries, 66% is near the absolute worst :).

by Laurent GUERBY on Fri Sep 14th, 2007 at 01:17:24 PM EST
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