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In that particular context they are talking about power density, which is W/kg. Energy density is another issue, and I probably confused them above.

With gasoline in a modern car getting 50 MPG you can go over 500 miles without stopping. But so what? You still have to stop to relieve yourself once in a while--in my case about once an hour, say 100 miles. Increasing the range beyond 100 miles is decreasingly important. The EV-1 had a practical range in bad conditions of about 100 miles, and batteries continue to improve...

by asdf on Tue Feb 7th, 2006 at 08:23:17 PM EST
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Increasing the range beyond 100 miles is decreasingly important.

Actually, it is pretty important. It directly affects the necessary frequency of charging stations.

by Egarwaen on Tue Feb 7th, 2006 at 10:20:16 PM EST
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